ࡱ>  ybjbj DYq@##11111-1-1-18e1T1-1Ope3H44445.55 AOCOCOCOCOCOCOQSXCO195599CO1144XO><><><91414AO><9AO><><uKN4G-19MF-OnO0O?NT:BTNT1N`5~6h><6T:7555COCO;^555O9999T555555555# /: Practice Problems for Part V 1. A random sample of 1,562 undergraduates enrolled in marketing courses was asked to respond on a scale from one (strongly disagree) to seven (strongly agree) to the proposition: "Advertising helps raise our standard of living." The sample mean response was 4.27 and the sample standard deviation was 1.32. Test at the 1% level, against a two-sided alternative, the null hypothesis that the population mean is 4.0. 2. A random sample of 76 percentage changes in promised pension benefits of single employer plans after the establishment of the Pension Benefit Guarantee Corporation was observed. The sample mean percentage change was 0.078 and the sample standard deviation was 0.201. Find and interpret the p-value of a test of the null hypothesis that the population mean percentage change is 0, against a two-sided alternative. 3. On the basis of a random sample, the null hypothesis H0: ( = (0 is tested against the alternative HA: ( > (0 and the null hypothesis is not rejected at the 5% significance level. Does this necessarily imply that (0 is contained in the 95% confidence interval for (? Does this necessarily imply that (0 is contained in the 95% confidence interval for (, if the observed sample mean is bigger than (0? 4. A beer distributor claims that a new display, featuring a life-size picture of a well-known athlete, will increase product sales in supermarkets by an average of 50 cases in a week. For a random sample of 20 supermarkets, the average sales increase was 41.3 cases and the sample standard deviation was 12.2 cases. Test at the 5% level the null hypothesis that the population mean sales increase is at least 50 cases, stating any assumption you make. 5. Of a sample of 361 owners of retail service and business firms that had gone into bankruptcy, 105 reported having no professional assistance prior to opening the business. Test the null hypothesis that at most 25% of all members of this population had no professional assistance before opening the business. 6. In a random sample of 160 business school graduates, seventy-two sample members indicated some measure of agreement with the statement: "A reputation for ethical conduct is less important for a manager's chances for promotion than a reputation for making money for the firm." Test the null hypothesis that one-half of all business school graduates would agree with this statement against a two-sided alternative. Find and interpret the p-value of the test. 7. The MATWES procedure was designed to measure attitudes toward women as managers. High scores indicate negative attitudes and low scores indicate positive attitudes. Independent random samples were taken of 151 male MBA students and 108 female MBA students. For the former group, the sample mean and standard deviation MATWES scores were 85.8 and 19.3, while the corresponding figures for the latter group were 71.5 and 12.2. Test the null hypothesis that the two population means are equal against the alternative that the true mean MATWES score is higher for male than for female MBA students. 8. In 1980, a random sample of 1,556 people was asked to respond to the statement: "Capitalism must be altered before any significant improvements in human welfare can be realized." Of these sample members, 38.4% agreed with the statement. When the same statement was presented to a random sample of 1,108 people in 1989, 52.0% agreed. Test the null hypothesis that the population proportions agreeing with this statement were the same in the two years, against the alternative that a higher proportion agreed in 1989. 9. Of a random sample of 381 investment-grade corporate bonds, 191 had sinking funds. Of an independent random sample of 166 speculative-grade corporate bonds, 145 had sinking funds. Test against a two-sided alternative the null hypothesis that the two population proportions are equal. 10. A wine producer claims that the proportion of its customers who cannot distinguish its product from frozen grape juice is at most 0.10. The producer decides to test this null hypothesis against the alternative that the true proportion is greater than 0.10. The decision rule adopted is to reject the null hypothesis if the sample proportion that cannot distinguish between these two flavors exceeds 0.14. If a random sample of 100 customers is chosen, what is the probability of a Type I error, using this decision rule? If a random sample of 400 customers is selected, what is the probability of a Type I error, using this decision rule? Explain, in words and graphically, why your answer differs from that in part (a). Suppose that the true proportion of customers who cannot distinguish between these flavors is 0.20. If a random sample of 100 customers is selected, what is the probability of a Type II error? Suppose that instead of the given decision rule, it is decided to reject the null hypothesis if the sample proportion of customers who cannot distinguish between the two flavors exceeds 0.16. A random sample of 100 customers is selected. Without doing the calculations, state whether the probability of a Type I error will be higher than, lower than, or the same as that in part (a). If the true proportion is 0.20, will the probability of a Type II error be higher than, lower than, or the same as that in part (c)? 11. State whether each of the following is true or false. The significance level of a test is the probability that the null hypothesis is false. A Type I error occurs when a true null hypothesis is rejected. A null hypothesis is rejected at the 0.025 level, but is accepted at the 0.01 level. This means that the p-value of the test is between 0.01 and 0.025. The power of a test is the probability of accepting a null hypothesis that is true. If a null hypothesis is rejected against an alternative at the 5% level, then using the same data, it must be rejected against that alternative at the 1% level. If a null hypothesis is rejected against an alternative at the 1% level, then using the same data it must be rejected against that alternative at the 5% level. The p-value of a test is the probability that the null hypothesis is true. 12. Supporters claim that a new windmill can generate an average of at least 800 kilowatts of power per day. Daily power generation for the windmill is assumed to be normally distributed with a standard deviation of 120 kilowatts. A random sample of 100 days is taken to test this claim against the alternative hypothesis that the true mean is less than 800 kilowatts. The claim will be accepted if the sample mean is 776 kilowatts or more and rejected otherwise. What is the probability ( of a Type I error using the decision rule if the population mean is in fact 800 kilowatts per day? What is the probability ( of a Type II error using this decision rule if the population mean is in fact 740 kilowatts per day? Suppose that the same decision rule is used, but with a sample of 200 days rather than 100 days. Would the value of ( be larger than, smaller than, or the same as that found in (a)? Would the value of ( be larger than, smaller than, or the same as that found in (b)? Suppose that a sample of 100 observations was taken but that the decision rule was changed so that the claim would be accepted if the sample mean was at least 765 kilowatts. Would the value of ( be larger than, smaller than, or the same as that found in (a)? Would the value of ( be larger than, smaller than, or the same as that found in (b)? 13. If a 0.05 level of significance is used in a two-tailed hypothesis test, what will you decide if the computed value of the test statistic is +2.21? 14. If a 0.10 level of significance is used in a two-tailed hypothesis test, what will be your decision rule in terms of z for rejecting a null hypothesis that the population mean is 500? 15. If a 0.01 level of significance were used in a two-tailed hypothesis test, what would be your decision rule in terms of z for rejecting H0:  EMBED Equation.3 ? 16. What would be your decision in #15 above if the computed value of the test statistic z were -2.61? 17. Suppose the director of manufacturing at a clothing factory needs to determine whether a new machine is producing a particular type of cloth according to the manufacturer's specifications, which indicate that the cloth should have a mean breaking strength of 70 pounds and a standard deviation of 3.5 pounds. A sample of 49 pieces reveals a sample mean of 69.1 pounds. State the null and alternative hypotheses. Is there evidence that cloth from this machine has an average breaking strength that is different from the manufacturer's specifications? (Use a .05 level of significance.) What will your answer be in (b) if the standard deviation is specified as 1.75 pounds? What will your answer be in (b) if the sample mean is 69 pounds? 18. A potential entrepreneur is considering the purchase of a coin-operated laundry. The present owner claims that over the past 5 years the average daily revenue has been $675. The buyer would like to find out if the true average daily revenue is different from $675. A sample of 30 selected days reveals a daily average revenue of $625, with a standard deviation of $75. State the null and alternative hypotheses. Is there evidence that the claim of the present owner is not valid? (Use a .01 level of significance.) What will your answer be in (b) if the standard deviation is now $100? What will your answer be in (b) if the sample mean is $650? 19. ATMs must be stocked with enough cash to satisfy customers making withdrawals over an entire weekend. On the other hand, if too much cash is unnecessarily kept in the ATMs, the bank is forgoing the opportunity of investing the money and earning interest. Suppose that at a particular branch the expected (i.e., population) average amount of money withdrawn from ATM machines per customer transaction over the weekend is $160 with an expected (i.e., population) standard deviation of $30. State the null and alternative hypotheses. If a random sample of 36 customer transactions is examined and it is observed that the sample mean withdrawal is $172, is there evidence to believe that the true average withdrawal is no longer $160? (Use a 0.05 level of significance.) What will your answer be in (b) if the standard deviation is really $24? What will your answer be in (b) if you use a 0.01 level of significance? 20. Suppose that in a two-tailed hypothesis test you compute the value of the test statistic as +2.00. What is the p-value? 21. Suppose that in a two-tailed hypothesis test you compute the value of the test statistic as -1.38. What is the p-value? 22. In #21 above, what is your statistical decision if you test the null hypothesis at the 0.01 level of significance? 23. Use the same information from Problem 17. Compute the p-value and interpret its meaning. What is your statistical decision if you test the null hypothesis at the 0.05 level of significance? Is there evidence that the machine is not meeting the manufacturer's specifications for average breaking strength? Compare your conclusions here with those of (b) in #17 above. 24. Use the same information from #19 above. Compute the p-value and interpret its meaning. What is your statistical decision if you test the null hypothesis at the 0.05 level of significance? Is there evidence to believe that the true average withdrawal is no longer $160? Compare your conclusions here with those of (b) in #19 above. 25. The Glen Valley Steel Company manufactures steel bars. If the production process is working properly, it turns out steel bars with an average length of at least 2.8 feet with a standard deviation of 0.20 foot (as determined from engineering specifications on the production equipment involved). Longer steel bars can be used or altered, but shorter bars must be scrapped. A sample of 25 bars is selected from the production line. The sample indicates an average length of 2.73 feet. The company wishes to determine whether the production equipment needs an immediate adjustment. State the null and alternative hypotheses. If the company wishes to test the hypothesis at the 0.05 level of significance, what decision would it make using the classical approach to hypothesis testing? Express your decision rule in terms of the average bar length in feet. If the company wishes to test the hypothesis at the 0.05 level of significance, what decision would it make using the p-value approach to hypothesis testing? Interpret the meaning of the p-value in this problem. Compare your conclusions in (b) and (c). 26. The director of manufacturing at a clothing factory needs to determine whether a new machine is producing a particular type of cloth according to the manufacturer's specifications, which indicate that the cloth should have a mean breaking strength of 70 pounds and a standard deviation of 3.5 pounds. The director is concerned that if the mean breaking strength is actually less than 70 pounds, the company will face too many lawsuits. A sample of 49 pieces reveals a sample mean of 69.1 pounds. Is there evidence that cloth from this machine has an average breaking strength that is less than the manufacturer's specifications? State the null and alternative hypotheses. At the 0.05 level of significance, is there evidence that the mean breaking strength is less than 70 pounds? Express your decision rule in terms of average breaking strength in pounds. At the 0.05 level of significance, using the p-value approach to hypothesis testing, is there evidence that the mean breaking strength is less than 70 pounds? Interpret the meaning of the p-value in this problem. Compare your conclusions in (b) and (c). 27. A manufacturer of salad dressings uses machines to dispense liquid ingredients into bottles that move along a filling line. The machine that dispenses dressings is working properly when 8 ounces are dispensed. The standard deviation of the process is 0.15 ounce. A sample of 50 bottles is selected periodically, and the filling line is stopped if there is evidence that the average amount dispensed is actually less than 8 ounces. Sup-pose that the average amount dispensed in a particular sample of 50 bottles is 7.983 ounces. State the null and alternative hypotheses. At the 0.05 level of significance, is there evidence that the average amount dispensed is less than 8 ounces? Express your decision rule in terms of the average amount of liquid dispensed. At the 0.05 level of significance, using the p-value approach to hypothesis testing, is there evidence that the average amount dispensed is less than 8 ounces? Interpret the meaning of the p-value in this problem. Compare your conclusions in (b) and (c). 28. The policy of a particular bank branch is that its ATMs must be stocked with enough cash to satisfy customers making withdrawals over an entire weekend. Customer goodwill depends on such services meeting customer needs. At this branch the expected (i.e., population) average amount of money withdrawn from ATM machines per customer over the weekend is $160 with an expected (i.e., population) standard deviation of $30. Suppose that a random sample of 36 customer transactions is examined and it is observed that the sample mean withdrawal is $172. State the null and alternative hypotheses. At the 0.05 level of significance, is there evidence to believe that the true average withdrawal is greater than $160? Express your decision rule in terms of average dollar value per withdrawal. At the 0.05 level of significance, using the p-value approach to hypothesis testing, is there evidence to believe that the true average withdrawal is greater than $160? Interpret the meaning of the p-value in this problem. Compare your conclusions in (b) and (c). 29. If, in a sample of size  EMBED Equation.3  selected from an underlying normal population, the sample mean is  EMBED Equation.3  and the sample standard deviation is  EMBED Equation.3 , what is the value of the t-test statistic if we are testing the null hypothesis H0 that  EMBED Equation.3 ? 30. In #29 above, how many degrees of freedom would there be in the one-sample t-test? 31. In #29 and #30 above, what are the critical values from the t-table if the level of significance ( is chosen to be 0.05 and the alternative hypothesis HA is as follows:  EMBED Equation.3 ?  EMBED Equation.3 ? 32. In #29, #30, and #31 above, what is your statistical decision if your alternative hypothesis HA is as follows:  EMBED Equation.3 ?  EMBED Equation.3 ? 33. The manager of the credit department for an oil company would like to determine whether the average monthly balance of credit card holders is equal to $75. An auditor selects a random sample of 100 accounts and finds that the average owed is $83.40 with a sample standard deviation of $23.65. Using the 0.05 level of significance, should the auditor conclude that there is evidence the average balance is different from $75? What is your answer in (a) if the standard deviation is $37.26? What is your answer in (a) if the sample mean is $78.81? 34. A manufacturer of detergent claims that the mean weight of a particular box of detergent is 3.25 pounds. A random sample of 64 boxes reveals a sample average of 3.238 pounds and a sample standard deviation of 0.117 pound. Using the 0.01 level of significance, is there evidence that the average weight of the boxes is different from 3.25 pounds? What is your answer in (a) if the standard deviation is 0.05 pound? What is your answer in (a) if the sample mean is 3.211 pounds? 35. A manufacturer of plastics wants to evaluate the durability of rectangularly molded plastic blocks that are to be used in furniture. A random sample of 50 such blocks is examined, and the hardness measurements (in Brinell units) are recorded as follows: 283.6273.3278.8238.7334.9302.6239.9254.6281.9270.4269.1250.1301.6289.2240.8267.5279.3228.4265.2285.9279.3252.3271.7235.0313.2277.8243.8295.5249.3228.7255.3267.2255.3281.0302.1256.3233.0194.4291.9263.7273.6267.7283.1260.9274.8277.4276.9259.5262.0263.5(a) Using the 0.05 level of significance, is there evidence that the average hardness of the plastic blocks exceeds 260 (in Brinell units)? What assumptions are made to perform this test? Find the p-value and interpret its meaning. What will be your answer in (a) if the first data value is 233.6 instead of 283.6? 36. If in a random sample of 400 items, 88 are found to be defective, what is the sample proportion of defective items? 37. In # 36 above, if it is hypothesized that 20% of the items in the population are defective, what is the value of the z-test statistic? 38. In #36 and #37 above, suppose you are testing the null hypothesis H0:  EMBED Equation.3  against the two-tailed alternative hypothesis HA:  EMBED Equation.3  and you choose the level of significance ( to be 0.05. What is your statistical decision? 39. A television manufacturer claims in its warranty that in the past not more than 10% of its television sets needed any repair during their first 2 years of operation. To test the validity of this claim, a government testing agency selects a sample of 100 sets and finds that 14 sets required some repair within their first 2 years of operation. Using the 0.01 level of significance, is the manufacturer's claim valid or is there evidence that the claim is not valid? compute the p-value and interpret its meaning. What is your answer in (a) if 18 sets required some repair? 40. The personnel director of a large insurance company is interested in reducing the turnover rate of data processing clerks in the first years of employment. Past records indicate that 25% of all new hires in this area are no longer employed at the end of 1 year. Extensive new training approaches are implemented for a sample of 150 new data processing clerks. At the end of a 1-year period, 29 of these 150 individuals are no longer employed. At the 0.01 level of significance, is there evidence that the proportion of data processing clerks who have gone through the new training and are no longer employed is less than 0.25? Compute the p-value and interpret its meaning. What is your answer to (a) if 22 of the individuals are no longer employed? 41. The marketing branch of the Mexican Tourist Bureau would like to increase the proportion of tourists who purchase silver jewelry while vacationing in Mexico from its present estimated value of 0.40. Toward this end, promotional literature describing both the beauty and value of the jewelry is prepared and distributed to all passengers on airplanes arriving at a certain seaside resort during a 1-week period. A sample of 500 passengers returning at the end of the 1-week period is randomly selected, and 227 of these passengers indicate that they purchased silver jewelry. At the 0.05 level of significance, is there evidence that the proportion has increased above the previous value of 0.40? Compute the p-value and interpret its meaning. What is your answer to (a) if 213 passengers indicate that they purchased silver jewelry? 42. The operations manager at a light bulb factory wants to determine if there is any difference in the average life expectancy of bulbs manufactured on two different types of machines. The process standard deviation of Machine I is 110 hours and of Machine II is 125 hours. A random sample of 25 light bulbs obtained from Machine I indicates a sample mean of 375 hours, and a similar sample of 25 from Machine II indicates a sample mean of 362 hours. Using the 0.05 level of significance, is there any evidence of a difference in the average life of bulbs produced by the two types of machines? Compute the p-value in (a) and interpret its meaning. 43. The purchasing director for an industrial parts factory is investigating the possibility of purchasing a new type of milling machine. She determines that the new machine will be bought if there is evidence that the parts produced have a higher average breaking strength than those from the old machine. A sample of 100 parts taken from the old machine indicated a sample mean of 65 kilograms and a sample standard deviation of 10 kilograms, whereas a similar sample of 100 from the new machine indicated a sample mean of 72 kilograms and a sample standard deviation of 9 kilograms. Using the 0.01 level of significance, is there evidence that the purchasing director should buy the new machine? Compute the p-value in (a) and interpret its meaning. 44. In intaglio printing, a design or figure is carved beneath the surface of hard metal or stone. Suppose that an experiment is designed to compare differences in average surface hardness of steel plates used in intaglio printing (measured in indentation numbers) based on two different surface conditions untreated versus treated by light polishing with emery paper. In the experiment 40 steel plates are randomly assigned, 20 that are untreated and 20 that are lightly polished. Use a 0.05 level of significance to determine whether there is evidence of a significant treatment effect (i.e., a significant difference in average surface hardness between the untreated and the polished steel plates) if the sample mean for the untreated plates is 163.4 and the sample mean for the polished plates is 156.9. The sample standard deviation in surface hardness (in indentation numbers) was 10.2 for the untreated surfaces and 6.4 for the lightly polished surfaces. 45. A real estate agency wants to compare the appraised values of single-family homes in two Nassau County, New York, communities. A sample of 60 listings in Farmingdale and 99 listings in Levittown yields the following results (in thousands of dollars): FarmingdaleLevittown EMBED Equation.3 191.33172.34S32.6016.92n6099At the 0.05 level of significance, is there evidence of a difference in the average appraised values for single-family homes in the two Nassau County communities? Do you think any of the assumptions needed in (a) have been violated? Explain. 46. The manager of a nationally known real estate agency has just completed a training session on appraisals for two newly hired agents. To evaluate the effectiveness of his training, the manager wishes to determine whether there is any difference in the appraised values placed on houses by these two different individuals. A sample of 12 houses is selected by the manager, and each agent is assigned the task of placing an appraised value (in thousands of dollars) on the 12 houses. The results are as follows: HOUSEAGENT 1AGENT 21181.0182.02179.9180.03163.0161.54218.0215.05213.0216.56175.0175.07217.9219.58151.0150.09164.9165.510192.5195.011225.0222.712177.5178.0At the 0.05 level of significance, is there evidence of a difference in the average appraised values given by the two agents? What assumption is necessary to perform this test? Find the p-value in (a) and interpret its meaning. 47. A few engineering students decide to see whether cars that supposedly do not need high-octane gasoline get more miles per gallon using regular or high-octane gas. They test several cars (under similar road surface, weather, and other driving conditions), using both types of gas in each car at different times. The mileage for each gas type for each car is as follows: CARGAS TYPE12345678910Regular15232135422819323124High-octane18212534473019273420Is there any evidence of a difference in the average gasoline mileage between regular and high-octane gas? (Use ( = 0.05.) What assumption is necessary to perform this test? Find the p-value in (a) and interpret its meaning. 48. In order to measure the effect of a storewide sales campaign on nonsale items, the research director of a national supermarket chain took a random sample of 13 pairs of stores that were matched according to average weekly sales volume. One store of each pair (the experimental group) was exposed to the sales campaign, and the other member of the pair (the control group) was not. The following data indicate the results over a weekly period: STOREWITH SALES CAMPAIGNWITHOUT SALES CAMPAIGN167.265.3259.454.7380.181.3447.639.8597.892.5638.437.9757.352.4875.269.9994.789.01064.358.41131.733.01249.341.71354.053.6At the 0.05 level of significance, can the research director conclude that there is evidence the sales campaign has increased the average sales of nonsale items? What assumption is necessary to perform this test? Find the p-value in (a) and interpret its meaning. 49. The R & M department store has two charge plans available for its credit-account customers. The management of the store wishes to collect information about each plan and to study the differences between the two plans. It is interested in the average monthly balance. Random samples of 25 accounts of Plan A and 50 accounts of Plan B are selected with the following results: PLAN APLAN B EMBED Equation.3  EMBED Equation.3  EMBED Equation.3  EMBED Equation.3  EMBED Equation.3  EMBED Equation.3 Use statistical inference (confidence intervals or tests of hypotheses) to draw conclusions about each of the following: Note: Use a level of significance of 0.01 (or use 99% confidence) throughout. Average monthly balance of all Plan B accounts. Is there evidence that the average monthly balance of Plan A accounts is different from $105? Is there evidence of a difference in the average monthly balances between Plan A and Plan B? Determine the p-values in (b) and (c) and interpret their meaning. On the basis of the results of (a), (b), (c), and (d), what will you tell the management about the two plans? 50. The manager of computer operations of a large company wishes to study computer usage of two departments within the company, the accounting department and the research department. A random sample of five jobs from the accounting department in the last week and six jobs from the research department in the last week are selected, and the processing time (in seconds) for each job is recorded. DepartmentProcessing Time (In Seconds)Accounting938712Research41310996Choosing a level of significance of 0.05 (or 95% confidence), use statistical inference (confidence intervals or tests of hypotheses) to draw conclusions about each of the following: Average processing time for all jobs in the accounting department. Is there evidence that the average processing time in the research department is greater than 6 seconds? Is there evidence of a difference in the mean processing time between the accounting department and the research department? What must you assume to do in (c)? Determine the p-values in (b) and (c), and interpret their meanings.     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