ࡱ> e Ibjbjqq A{p\p\S0   8&BT,8$($$b&eee$%۵eGeee$b&]ߖߖߖeZ$lb&ߖeߖߖ,b&(:Ыɰ06uu,u0eeߖeeeeeёeeeeeeeueeeeeeeee > \: CHAPTER 8: CONFIDENCE INTERVAL ESTIMATES for Means and Proportions Introduction: We want to know the value of a parameter for a population. We dont know the value of this parameter for the entire population because we dont have data for the entire population. (If we did already know the value of the parameter, we wouldnt need to do any statistical investigation or calculations.) We will use sample statistics to estimate population parameters. Recall from chapter 2: A parameter is ______________________________________________________ ______________________________________________________________________________________ If we dont know the value of a population parameter, we can estimate it using a sample statistic. Recall from chapter 2: A statistic is_________________________________________________________ ______________________________________________________________________________________ Using data from a sample to draw a conclusion about a population is called ________________ statistics. Two Types of Estimates for population parameters: POINT ESTIMATE: A population parameter can be estimated by one number: the sample statistic. This is called a point estimate. (Statistical theory has identified desirable properties of point estimates, which are studied in more depth in upper level statistics classes. One desirable property is that a point estimate be unbiased, meaning that the average of the point estimates from all possible samples would equal the true value of the population parameter.) The best point estimate of a population mean is_________________________________________ The best point estimate of a population proportion p is_____________________________________ The best point estimate of a population standard deviation ( is_______________________________ CONFIDENCE INTERVAL ESTIMATE: The population parameter is estimated by an interval of numbers that we believe contains the true (unknown) value of the population parameter. We can state how confident we are that the interval estimate contains the true value of the parameter. This confidence interval estimate is built using two items: a point estimate, and margins of error The margins of error are also called error bounds. We will use confidence interval estimates based on sample data to estimate a population average (mean) and to estimate a population proportion. Confidence intervals for means and proportions are symmetric; the point estimate is at the center of the interval. The endpoints of the interval are found as. (point estimate error bound , point estimate + error bound ) For some other parameters, such as standard deviation, a confidence interval may not be symmetric about the point estimate, moving different distances above and below the point estimate to the ends of the interval estimate. Well start in class by examining a jar with beads to determine the proportion of beads in the jar that are blue; after we explore the concepts, then well move on to the mathematical calculations. In Examples 1, 2, 3 we learn to calculate the point estimates and the error bounds and what they mean. The last 3 pages of these notes has a concise summary of formulas, procedures, and interpretations.  CHAPTER 8 EXAMPLE 1:CONFIDENCE INTERVAL ESTIMATE for an unknown POPULATION PROPORTION p a. Statistics and data in this example are based on information from :  HYPERLINK "http://sf.streetsblog.org/2014/08/15/car-free-households-are-booming-in-san-francisco/" http://sf.streetsblog.org/2014/08/15/car-free-households-are-booming-in-san-francisco/  HYPERLINK "http://en.wikipedia.org/wiki/List_of_U.S._cities_with_most_households_without_a_car" http://en.wikipedia.org/wiki/List_of_U.S._cities_with_most_households_without_a_car A trend in urban development is to reduce the need for residents to have a car; city neighborhoods are often ranked for walkability. The US city with the lowest car ownership rate is New York City; a majority (56%) of households are car-free with only 44% of households owning any vehicles. San Jose has the highest car ownership rate of large US cities; only about 6% of households car-free. San Franciscos percent of car-free households has changed rapidly in recent years. Suppose a recent study of 1200 households in San Francisco showed that 372 households were car-free. Construct and interpret a 95% confidence interval for the true proportion of households in San Francisco that are car-free. Use a 95% confidence level. population parameter: p = ____________________________________________________________ ____________________________________________________________ random variable p( = __________________________________________________________________ We are using sample data to estimate an unknown proportion for the whole population HOW TO CALCULATE THE CONFIDENCE INTERVALPoint Estimate = p (Confidence Level CL is area in the middle Critical Value is  EMBED Equation.3  is the Z value that creates area of CL in the middle; Z ~N(0,1) Use POSITIVE value of Z invnorm EMBED Equation.3 Standard Error  EMBED Equation.3 Error Bound = (Critical Value)(Standard Error) EBP = EMBED Equation.3   EMBED Equation.3 Confidence Interval = Point Estimate + Error Bound Confidence Interval = p ( + EBP Calculations and interpretation in context of the problem: CHAPTER 8 EXAMPLE 1: Using Confidence Intervals 1b. In Chapter 9 well learn a more appropriate technique for asking and answering questions about a particular possible value of a parameter. At this point, however, well use our confidence interval estimate of the parameter to see if it can provide any insight into the parameters value. In Example 1 the point estimate is ____ = _______ ; the confidence interval is ___________________ (i) Can we conclude with 95% confidence that more than 25% of SF households are car-free? Explain. (ii) Can we conclude with 95% confidence that more than 30% of SF households are car-free? Explain. 1c. What does it mean when we say the confidence level is 95% or that "we are 95% confident"? CHAPTER 8 EXAMPLE 2:CONFIDENCE INTERVAL ESTIMATE for unknown POPULATION MEAN ( when the POPULATION STANDARD DEVIATION ( is KNOWN A soda bottling plant fills cans labeled to contain 12 ounces of soda. The filling machine varies and does not fill each can with exactly 12 ounces. To determine if the filling machine needs adjustment, each day the quality control manager measures the amount of soda per can for a random sample of 50 cans. Experience shows that its filling machines have a known population standard deviation of 0.35 ounces. In today's sample of 50 cans of soda, the sample average amount of soda per can is 12.1 ounces. Construct and interpret a 90% confidence interval estimate for the true population average amount of soda contained in all cans filled today at this bottling plant. Use a 90% confidence level. X = __________________________________________________________________________________ population parameter: ( = ________________________________________________________________ random variable  EMBED Equation.3  = ____________________________________________________________________ We are using sample data to estimate an unknown mean (average) for the whole population HOW TO CALCULATE THE CONFIDENCE INTERVAL for When ( IS known, use the Standard normal distribution Z ~ N(0,1)Point Estimate =  EMBED Equation.3 Confidence Level CL is area in the middle Critical Value is  EMBED Equation.3  is the Z value that creates area of CL in the middle; Z ~N(0,1) Use POSITIVE value of Z invnorm EMBED Equation.3 Standard Error  EMBED Equation.3 Error Bound = (Critical Value)(Standard Error) EBM = EMBED Equation.3  EMBED Equation.3 Confidence Interval = Point Estimate + Error Bound Confidence Interval =  EMBED Equation.3  + EBM Calculations and interpretation in context of the problem: CHAPTER 8 EXAMPLE 3:CONFIDENCE INTERVAL ESTIMATE for unknown POPULATION MEAN ( when the POPULATION STANDARD DEVIATION ( is NOT KNOWN a. The traffic commissioner wants to know the average speed of all vehicles driving on River Rd. Police use radar to observe the speeds for a sample of 20 vehicles on River Rd. For the vehicles in the sample, the average speed is 31.3 miles per hour with standard deviation 7.0 mph. Construct and interpret a 98% confidence interval estimate of the true population average speed of all vehicles on River Rd. Use a 98% confidence level. X = ________________________________________________________________________ population parameter: ( = ________________________________________________________________ random variable  EMBED Equation.3  = ____________________________________________________________________ We are using sample data to estimate an unknown mean (average) for the whole population HOW TO CALCULATE THE CONFIDENCE INTERVAL for When ( is NOT known, use the t distribution with degrees of freedom = sample size ( 1 : t with df = n ( 1)Point Estimate =  EMBED Equation.3 Confidence Level CL is area in the middle Critical Value  EMBED Equation.3  is the t value that creates an area of CL in the middle; Use t distribution with df = n ( 1 Use POSITIVE value of t TI-84:  EMBED Equation.3 = invT(area to left, df) Standard Error  EMBED Equation.3 Error Bound = (Critical Value)(Standard Error) EBM = EMBED Equation.3   EMBED Equation.3 Confidence Interval = Point Estimate + Error Bound Confidence Interval =  EMBED Equation.3  + EBM Calculations and interpretation in context of the problem: ___ b. In Example 3, suppose that you were not given the sample mean and sample standard deviation and instead you were given a list of data for the speeds (in miles per hour) of the 20 vehicles. 1919222425272837353037363940433031363335 How would you use the data to do this problem?  ___ CHAPTER 8: Confidence Interval for a Proportion: Calculating the Sample Size needed in a Study Given a desired confidence level and a desired margin of error, how large a sample is needed? EBP =  EMBED Equation.3   EMBED Equation.3  We know the error bound EBP that we want. We know the confidence level CL we want, so we can find  EMBED Equation.3  corresponding to the desired CL. We don't know p' or q' until we do the study, so we will assume for now that p' = q' = = 0.5 Then we can substitute all these values into EBP =  EMBED Equation.3   EMBED Equation.3  and solve for n. Solving EBP =  EMBED Equation.3   EMBED Equation.3  for n gives . n =  EMBED Equation.3  p' q' . Sample Size Formula to determine sample size n needed when estimating a population proportion p SHAPE \* MERGEFORMAT The 0.25 appears in the formula because we are assuming that p' = q' = = 0.5 ALWAYS ROUND UP to the next higher integer EXAMPLE 4: Finding the Sample Size: a. Public opinion and political polls often do surveys with a 95% confidence level and 3% margin of error. Find the sample size needed. n =  EMBED Equation.3 (.25) = b. Suppose a margin of error of 2% was wanted with a 95% confidence level. Find the sample size needed. n =  EMBED Equation.3 (.25) = c. Suppose a margin of error of 3% was wanted with a 90% confidence level. Find the sample size needed. n =  EMBED Equation.3 (.25) = d. Suppose a poll uses a sample size of n=100, and a confidence level of 95%. Estimate the expected error bound using p' = q' = = 0.5  EBP =  EMBED Equation.3   EMBED Equation.3  e. Is the error bound in part d large or small compared to the examples in parts a, b, c? Explain why this happened. CHAPTER 8 EXTRA PRACTICE EXAMPLES : CALCULATING CONFIDENCE INTERVALS Sources for Practice Examples: #5 based on Chapter 8 Practice in Introductory Statistics from OpenStax available for download for free at  HYPERLINK "http://cnx.org/content 11562/latest/" http://cnx.org/content 11562/latest/. ; #6 based on car rental rate information from www.tripadvisor.com on 1/8/2019; #7 based on information from  HYPERLINK "http://www.pewinternet.org/2016/02/11/15-percent-of-american-adults-have-used-online-dating-sites-or-mobile-dating-apps/" http://www.pewinternet.org/2016/02/11/15-percent-of-american-adults-have-used-online-dating-sites-or-mobile-dating-apps/ ; #8 based on information from http://www.pewsocialtrends.org/2016/05/24/for-first-time-in-modern-era-living-with-parents-edges-out-other-living-arrangements-for-18-to-34-year-olds/ ; PRACTICE EXAMPLE 5: A supermarket chain is deciding what produce providers to purchase from. A sample of 20 heads of lettuce is selected to estimate the average weight of the lettuce from this provider. The population standard deviation for the weight is known to be 0.2 pounds. The sample of 20 heads of lettuce had a mean weight of 2.2 pounds with a sample standard deviation of 0.1 pounds. Calculate and interpret a confidence interval estimate for the true average weight of all heads of lettuce from this provider. Use a 90% confidence level. PRACTICE EXAMPLE 6: If you rent a car from Enterprise Car Rental, the daily rental rate for the same car in the same city can vary depending on which Enterprise location location in the city you rent the car from. On January 8, 2019, daily rental rates at a sample of 8 San Francisco locations for a Hyundai Elantra were quoted as $30, $31, $31, $32, $35, $36, $36, $43. Calculate and interpret a 96% confidence interval estimate for the true average daily rental rate for a Hyundai Elantra at all Enterprise locations in San Francisco on that date. Use a 96% confidence level. PRACTICE EXAMPLE 7: Suppose a survey of 600 young adults age 18 to 24 showed that 162 had used online dating. Calculate and interpret a confidence interval estimate for the true proportion of all young adults age 18 to 24 who ever used online dating. Use a 95% confidence level. PRACTICE EXAMPLE 8: Suppose a survey of 500 people age 18 to 34 indicated that 32.2% of them live with one or both of their parents. Calculate and interpret a confidence interval estimate for the true proportion of all people age 18 to 34 who live with one or both parents. Use a 94% confidence level. ____________________________________________________________________________________________________________________________ CHAPTER 8: FLOW CHART VIEW OF FORMULAS FOR CONFIDENCE INTERVAL ESTIMATES 2015 R. Bloom For more details, see the presentation of the formulas in boxes for each case on the next page.              CHAPTER 8: CONFIDENCE INTERVALS: SUMMARY OF FORMULAS, PROCEDURES, & INTERPRETATIONS Confidence Interval for a Proportion p To estimate a population proportion p (binomial probability of success). Point Estimate + Margin of Error (Margin of Error is also called Error Bound) Point Estimate: Sample Proportion:  EMBED Equation.3  Error Bound: EBP = (critical value)(standard error) = EMBED Equation.3   EMBED Equation.3   The critical value  EMBED Equation.3 depends on the confidence level.  EMBED Equation.3  is the Z value that puts an area equal to the   EMBED Equation.3  tells us how many "appropriate standard deviations" to enclose about the point estimate, Confidence Interval: p( + EBP which is p( +  EMBED Equation.3   EMBED Equation.3  Confidence Interval for a Mean ( when ( is known To estimate the population average ( if we already know the population standard deviation ( . Point Estimate + Margin of Error (Margin of Error is also called Error Bound) Point Estimate: Sample Average (Sample Mean)  EMBED Equation.3  Error Bound: EBM = (critical value)(standard error) = EMBED Equation.3   EMBED Equation.3   The critical value  EMBED Equation.3 depends on the confidence level.  EMBED Equation.3  is the Z value that puts an area equal to the   EMBED Equation.3  tells us how many "appropriate standard deviations" to enclose about the point estimate, Confidence Interval:  EMBED Equation.3  + EBM which is  EMBED Equation.3  +  EMBED Equation.3   EMBED Equation.3  Confidence Interval for a Mean ( when ( is NOT known To estimate the population average ( and we do not know the population standard deviation (. Use the sample standard deviation s to estimate the population standard deviation ( Point Estimate + Margin of Error (Margin of Error is also called Error Bound) Point Estimate: Sample Average (Sample Mean)  EMBED Equation.3  Error Bound: EBM = (critical value)(standard error) = EMBED Equation.3   EMBED Equation.3   The critical value  EMBED Equation.3 depends on the confidence level.  EMBED Equation.3  is the  EMBED Equation.3  value that puts an area equal to the  EMBED Equation.3  tells us how many "appropriate standard deviations" we need to move away from the point estimate, Confidence Interval:  EMBED Equation.3  + EBM which is  EMBED Equation.3  +  EMBED Equation.3   EMBED Equation.3  YOU ARE NOT PERMITTED TO BRING A PRINTOUT OF THIS PAGE AS YOUR NOTES FOR AN EXAM OR QUIZ. You CAN write whatever information you want from this page into your handwritten notes for exams or quizzes. 2016 R. Bloom CHAPTER 8: CONFIDENCE INTERVALS: SUMMARY OF FORMULAS, PROCEDURES, & INTERPRETATIONS Interpreting the Confidence Interval for a PROPORTION (2 ways to word it) We estimate with _____% confidence that the true proportion of the population that describe the population parameter in the situation of this problem is between ______ and ________ We estimate with _____% confidence that between _______% and _______% of the population describe the population parameter in the situation of this problem Interpreting the Confidence Interval for a MEAN (average) We estimate with _____% confidence that the true population average (or mean) describe the population parameter in the situation of this problem is between _______ and _________ What is the meaning of the Confidence Level? What does it mean to be CL% confident? The confidence level represents an expected accuracy rate for the confidence interval process. It tells us what percent of confidence intervals calculated in this manner would be good estimates. If we took repeated samples and calculated many confidence interval estimates (one for each sample), we expect that CL% of the confidence interval estimates would be good estimates that successfully enclose (capture) the true value of the population parameter that we want to estimate. If we took repeated samples), we expect that 100% " CL% of the confidence interval estimates would be  bad estimates that would NOT enclose (capture) the true value of the population parameter. Note that the confidence interval does not estimate individual data values. It estimates proportions or averages. It does NOT imply that CL% of the data lies within the confidence interval. Finding the Point Estimate and Error Bound (Margin of Error) if we know the Confidence Interval: The interval is (lower bound, upper bound) Point Estimate = (lower bound + upper bound)/2 Error Bound = (upper bound lower bound)/2 To find Z that puts the area equal to the confidence level in the middle CL specifies the area in the middle ( = 1 " CL is area  outside , split equally between both tails   EMBED Equation.3  is area in one tail. OR use invnorm( EMBED Equation.3  , 0, 1) and take absolute value (drop the """ sign) Without calculator: Use a standard normal probability table to find Z. To find t that puts the area equal to the confidence level  in the middle CL specifies the area in the middle ( = 1 " CL is area  outside , split equally between both tails   EMBED Equation.3  is area in one tail. df = degrees of freedom = n"1 OR use invT ( EMBED Equation.3  , df) and take absolute value (drop the """ sign) TI-83,83+: Use INVT program; ask instructor to download it to your calculator: PRGM INVT enter area to the left and df after prompts: area to left is 1" EMBED Equation.3  ; (if using  EMBED Equation.3 as area to left , drop the """ sign) Without calculator or if calculator does not have inverse t: Use a student s-t distribution probability table. Value of t is found at the intersection of the column for the confidence level and row for degrees of freedom YOU ARE NOT PERMITTED TO BRING A PRINTOUT OF THIS PAGE AS YOUR NOTES FOR AN EXAM OR QUIZ. You CAN write whatever information you want from this page into your handwritten notes for exams or quizzes. 2016 R. Bloom     Page  PAGE 9 of  NUMPAGES 9 Confidence Interval Notes, by Roberta Bloom De Anza College This work is licensed under a  HYPERLINK "https://creativecommons.org/licenses/by-sa/4.0/" Creative Commons Attribution-ShareAlike 4.0 International License.. Some material derived from Introductory Statistics from Open Stax (Ilvlowsky/Dean) available for download for free at  HYPERLINK "http://cnx.org/content 11562/latest/" http://cnx.org/content 11562/latest/ or  HYPERLINK "https://openstax.org/details/introductory-statistics" https://openstax.org/details/introductory-statistics NOTE: Use of t-distribution requires the underlying population of individual values to be approximately normally distributed. It is OK if this assumption is violated a little, but if the underlying population of individual values has a distribution that differs too much from the normal distribution, then this confidence method is not appropriate, and statisticians would use other techniques that we do not study in Math 10. n =  EMBED Equation.3 (.25) Note the actual error bound will differ after the study is done because we will know p' and q' and will no longer be estimating that p'=q'=0.5 Proportion p Mean m (average) Point Estimate p2 Error Bound: EBP =  EMBED Equation.3   EMBED Equation.3  Mean m (average) if population standard deviation s IS KNOWN Mean m (average) if populatio)DERUV`d  $ > L P    $   # øøíøíøâ×ÎÃÃÎ{s{ÃjhbhCJ hbh_5hbh5hbhg[CJaJhbhCJhbh(CJaJhbhP8CJaJhbhPNCJaJhbh#ZCJaJhbhCJaJhbh5CJaJhbhCJhbh5OJQJ^JhbhPN5OJQJ^J)DE    ; l,-LF & FLP^`LgdE & FP]`gdE P]gde]gddhgdgd$a$gd        " : ; J K L b h ˽ui]i]iiThbhg[CJhbhF 5CJaJhbh5CJaJhbh5CJaJhbhPN5CJaJ#hbhPN5CJOJQJ^JaJhbh5CJ OJQJ^Jhbh5OJQJ^JhbhF 5OJQJ^JhbhCJhbh(CJaJhbhg[CJaJhbhCJaJhbhCJaJ + , Q [ Lfkl ",-JKLMxEFܾti^ShbhECJaJhbh#ZCJaJhbhiCCJaJhbh5CJaJhbhCJaJhbhF CJaJhbhCJaJhbhPNCJaJ#hbhPN5CJOJQJ^JaJhbhCJ jshbh#ZCJhbhECJhbh#ZCJhbhiCCJhbheCJhbhCJ FKg)+EXmq{37SUVWXq89 fg޲x jhbhMuUmHnHuhbhDY5CJhbhDYCJaJhbhDYCJhbhiCCJaJhbh#ZCJaJhbhF CJaJhbh(CJaJhbhCJaJhbhECJaJhbh5CJaJhbhCJaJ*qX89f . $$If]a$*$d%d&d'dNOPQ]gd1ogdgdDY^gdMu & F#E^#`EgdE & FLP^`LgdEghy|)+./0ճscsOsE:hbhiYCJaJhbhiY5\&hbhiY5CJOJQJ\^JaJhbhUy5OJQJ\^JhbhiY5OJQJ\^Jhbh.-5CJOJQJ\hbhECJaJ(jhbhECJUaJmHnHuhbhCJaJhbhEmHnHuhbh(CJaJhbh#ZCJaJhbhDYCJaJ(jhbhMuCJUaJmHnHu./0y{vvvfffvv{ & Fh^h`gdegdye]}kd$$Ifl0pR& t0&644 laytME 015Hvwxy4578ARtuvwxzBGYZ[`ŴŴ꩞}r}hbh]TCJaJhbh<8!CJaJhbheCJaJhbh|?CJaJhbh'ZICJaJhbhyeCJaJ!hbhye0JB*CJaJphjhbhyeCJUaJhbh<8!CJaJhbh|?CJaJhbhyeCJaJhbhyeCJaJ+$'==>?ghi¹~sg\Qhbh<_pCJaJhbh<_pCJaJhbh<_p5CJaJhbhiYCJ aJhbhiYCJaJ jhbh@uCJhbh@uCJhbhKCJhbhiYCJhbh@uCJhbhiYCJhbhiYCJaJ hbhyehbh]TCJaJhbhyeCJaJhbhyeCJaJhbhCJaJ<=>?hi~qaX $Ifgd<_p$H$If]Ha$gd<_pikd$$Ifln(( t0(44 laytA $$Ifa$gdA]] dh] iz|}~+,34GHIJZ[\oĵxfUxx!j?hbh<_pCJEHUaJ#jT hbh<_pCJUVaJjhbh<_pCJUaJ!jhbhACJEHUaJ#jL hbhACJUVaJhbhACJaJjhbhACJUaJhbhACJaJhbh<_pCJaJ jhbh<_pCJaJhbh<_pCJaJhbh<_p5CJaJ+,KZ[s $$Ifa$gdA$$If]a$gdA $If]gdA $Ifgd<_popqrst&'}k^SSE jhbh<_pCJaJhbh<_pCJaJj hbh<_pEHU#jlH hbh<_pCJUVaJjhbh<_pEHU#jL hbh<_pCJUVaJjhbh<_pUhbh<_p5 hbh<_phbh<_pCJaJhbh<_p5CJaJjhbh<_pCJUaJ!jhbh<_pCJEHUaJ#jlH hbh<_pCJUVaJstn^^QE $$Ifa$gdA $If]gd<_p$H$If]Ha$gd<_pkd$$Ifl4F"n(h` t0(    44 layt<_p012naTG; $$Ifa$gdA $If]gd<_p $If]gd<_p H$If]Hgd<_pkd $$Ifl4F"n(h  t0(    44 layt<_p')*0234mnopqz{|ƺypcUGUhbhMuOJQJ\^Jhbh3OJQJ\^JhbhUyOJQJ^Jhbh6CJhbh65CJaJhbhC5CJaJhbhiY5CJ hbh.-hbhiY5CJaJhbh<_p>*CJaJhbhiY>*CJaJhbh<_p5CJaJhbh<_pCJaJhbh<_p6CJaJhbh<_p>*CJaJhbh<_pCJaJ234opqrstun]]]T]]]]]gd.-$]^`a$kd $$Ifl4F"n(h  t0(    44 layt<_p uvwxyz{|}~HAB $]a$gds$]^`a$gd3$]^`a$GH -GVj   ǹ}}}t}k_k_}t}hbhb5CJaJhE5CJaJhb5CJaJhbhXJ5CJaJhbhP85CJaJhbhe5CJaJhbh7T5CJaJhbhE5CJaJhbh35CJ\aJhbh3OJQJ\^JhbhfOJQJ\^Jhbh7TOJQJ\^JhbhsOJQJ\^J#         | } ~  $]^`a$gd-8$b]b^`a$gdXJ $]a$gdXJ      ! 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hbhE!hbhE0JB*CJaJphjhbhECJUaJhbhE@CJaJhbhE@CJaJhbhMuCJaJhbhECJaJ&jhbhE0JB*CJUphhbhE0JB*CJphhbhECJjhbhECJUhbhMuCJhbhECJcccddg@gBgDgNgPgggļĨyh\h*eyh*ey5OJQJ!jhh|hkCJEHUaJj%-[ hkCJUVaJ!jhh|hkCJEHUaJj%-[ hkCJUVaJjh1oCJUaJh1oCJaJh*eyCJaJhh1oCJaJh+hPNh1oOJQJhh|h1oh$h?fh$6CJaJh$6CJaJ#ggggggh4,4.4H4L4N4j4l4n44444444444òum^Oj~ҎY h1oCJUVaJjhh1oCJUaJh1oCJaJ#jhkCJEHOJQJU^Jj'-[ hkCJUVaJhkCJOJQJ^JjhkCJOJQJU^J hh*eyCJOJQJ^JaJhh1oCJaJh*eyh1o5h*eyh1o5OJQJUhPNh1oOJQJhPNh1oh*eyh*ey5n standard deviation s IS NOT KNOWN Point Estimate  EMBED Equation.3  Error Bound: EBM =  EMBED Equation.3   EMBED Equation.3  Point Estimate:  EMBED Equation.3  Error Bound: EBM =  EMBED Equation.3   EMBED Equation.3  Distribution: Normal Distribution: Normal Distribution: Students t tn-1 degrees of freedom = n(1 confidence level (CL) in the middle of standard normal distribution N(0,1) where the "standard error"  EMBED Equation.3  is the appropriate standard deviation for a proportion confidence level (CL) in the middle of standard normal distribution N(0,1) where the "standard error"  EMBED Equation.3  is the appropriate standard deviation for the sample mean confidence level (CL) in the middle of the student  EMBED Equation.3 -distribution with n ( 1 degrees of freedom where  EMBED Equation.3  is an estimate of the standard error ("appropriate standard deviation") for the sample mean To find  EMBED Equation.3 444445 5"5$5&5(5*5J5L5r5t5v5x5555555555±ԭԙ~ldUD!j)hi"h1oCJEHUaJj)ҎY h1oCJUVaJh1oCJaJ#jhkCJEHOJQJU^Jj'-[ hkCJUVaJhkCJOJQJ^JjhkCJOJQJU^JhPNh1o!jdhhkCJEHUaJ#j%-[ hhkCJUVaJhh1oCJaJjhh1oCJUaJ!jhi"h1oCJEHUaJ*5z55666666%6&6=6>6Y6^6w6x6y6z6661727}7 h]gd1o $]a$gd1o]gdE gd1o]gd1o555566666$6%6&6;6<6=6>6V6W6X6Y6Z6]6s6t6u6x6y6z666666666666徺岺岞xkah1o@CJaJhh1o@CJaJ j-h6CJaJh+h1o6CJaJh+h1o6CJEHH*h+h1o6hnIhnI5CJaJh1oCJaJhPNh1o!jhhkCJEHUaJ#j%-[ hhkCJUVaJhh1oCJaJjhh1oCJUaJ&6666666071727U7V7X7{7|7~77777777777777788888!8"858rghrh1oCJaJ!jwhh1oCJEHUaJ#jH hh1oCJUVaJh1oCJaJh1o@CJaJhh1o@CJaJh1oh:zh1oCJaJ!j?hh1oCJEHUaJ#jlH 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