ࡱ> q` NbjbjqPqP .^::kvvvvvvv8&d<8pBBBB1117777777$:h<h7v111117vvBBp81vBvB717E3 vvI6B WWL<e5<78085^=^=xI6^=vI6H1111111771X11181111dvvvvvv 1. Old Homework Which of the following are true? If false, explain briefly. a) A very high p-value is strong evidence that the null hypothesis is false. b) A very low p-value proves that the null hypothesis is false. c) A high p-value shows that the null hypothesis is true. d) A p-value below 0.05 is always considered sufficient evidence to reject the null hypothesis. e) A very low p-value provides evidence against the null hypothesis. f) A high p-value is strong evidence in favor of the null hypothesis. g) A p-value above 0.01 shows that the null hypothesis is true. h) If the null hypothesis is true, you can't get a p-value below 0.01. Answers: a) False. A high p-value shows that the data are compatible with the null hypothesis, and provides no evidence for rejecting the null hypothesis. b) False. It results in rejecting the null hypothesis, but does not definitively prove that the null hypothesis is false. It only means that the null hypothesis has a low probability of being true. c) False. A high p-value shows that the data are compatible with the null hypothesis. It leaves us uncertain. We conclude only that we have insufficient evidence to reject the null hypothesis. d) False. Whether a given p-value results in rejecting the null hypothesis depends on the  level we have chosen beforehand. If our  = 0.01, then even if p < 0.05 we might not reject the null hypothesis. e) True. f) False. A high p-value merely means that the data are compatible with the null hypothesis. The null hypothesis is therefore merely plausible, not proven. g) False. No p-value ever shows that the null hypothesis is true; if p > our chosen  level (e.g., 0.01) we merely conclude the following: "we fail to reject the null hypothesis." h) False. You will get a p-value below 0.01 about once in a hundred times! Work this problem: A machine being used for packaging seedless golden raisins has been set so that, on average, 15 ounces of raisins will be packaged per box. The quality-control engineer wishes to test the machine setting and selects a sample of 30 consecutive raisin packages filled during the production process. Their weights are found in the spreadsheet raisins.xls (class website). Is there evidence that the mean weight per box is different from 15 ounces? (Use  = 0.05.) Set up formulas, compute t-statistic (t-test of one mean,  unknown, two-tailed test. Don't worry about the p-value (yet). Follow the procedure used in the sea otter pup example above. 2. 1- and 2-Tailed Hypothesis Tests In the last lecture we learned that, for statistical hypothesis testing,  is the probability of a Type 1 error (that is, of rejecting the null hypothesis when the null hypothesis is true). For example, for our sea otter pup problem, the null and alternative hypotheses were: H0:  = 800g H1:  `" 800g This means we would reject H0 if the mean weight for our sample of n = 25 sea otter pups were either a lot larger, or a lot smaller, than 800. This is called a two-tailed test, because we reject H0 if our z or t statistic falls into either the far left or far right of the sampling distribution:  However, sometimes we are only interested in knowing whether a mean is below (but not above) some value (for example, checking if sea otter pups are malnourished). Other times we are interested in knowing whether a mean is above (but not below) some hypothesized value (e.g., testing if sea otter pups are too fat). For either of these cases, we perform what is called a one-tailed test. Here we reject H0 only if our z or t statistic falls in far left, or the far right, depending on our alternative hypothesis.  Panel A: H0:  = 800; H1:  `" 800 Panel B: H0:  = 800; H1:  > 800 Panel C: H0:  = 800; H1:  < 800 Always using two-tailed tests is preferred, because it rules out the possibility of 'cheating' by reversing the direction of a one-tailed test once one collects data. For the final exam, all computational problems will involve two-tailed tests. Video: One- and Two-Tailed Tests  HYPERLINK "https://www.youtube.com/watch?v=mvye6X_0upA" https://www.youtube.com/watch?v=mvye6X_0upA We will continue this topic tomorrow. 3. Standard Error and Confidence Interval of a Proportion If we know the standard error of a proportion (e.g., the proportion of females enrolled at CalPoly, the proportion of manufactured parts that are defective), then we can also (1) calculate confidence intervals for the proportion, and (2) test inferences concerning the value of a proportion. Here we make use of two convenient facts. First, like a population mean, a population proportion has a sampling distribution; the standard error of this sampling distribution is:  EMBED Equation.3  If we know the population proportion , we use that in the equation above. Otherwise we use p as an estimate of , or:  EMBED Equation.3  Note: The book makes a minor technical distinction between these above equations, calling one the standard deviation of a proportion, or SDp. For us this distinction is unimportant. We will call both the standard error of a proportion. Second, under certain conditions, the sampling distribution of a population proportion is well approximated by a normal (Gaussian) distribution. The conditions are: A reasonably large n (e.g., n > 50) 0.10 < NO^_  v w     A B t u   $ ' Žűűűűũűũűũűũűũ~~hnCJaJhnhy!6CJaJhy!hy!CJaJhy!hy!>*CJaJhy!CJaJhnh6CJaJh.CJaJhCJaJh OJQJhJwrB*CJ OJQJphh B*CJ OJQJphh|B*CJ OJQJph1NO v  A $ 601gdJxgdngdhgdgd $a$gd MN' < I g h t u  & + , ?  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If we don't know , then we estimate it using the sample proportion, p. Similarly, we can construct a z-statistic to test the value of a single proportion. This is the so-called normal approximation test of a proportion. However as  approaches 0 or 1 (especially with a small n), it's sampling distribution is no longer approximated by a normal curve and the above method is unsuitable: Sampling Distribution of Proportion ( = 0.1, n = 10)  For this and other reason, computing confidence intervals of a proportion based on a normal distribution is rapidly being replaced by more exact, computation intensive methods. There are lot's of online calculators to construct exact confidence intervals for a proportion:  HYPERLINK "http://www.causascientia.org/math_stat/ProportionCI.html" http://www.causascientia.org/math_stat/ProportionCI.html Example: Assume that population proportion of female students at CalPoly is 0.45. What is the standard error of a sample proportion of n = 25 students.  EMBED Equation.3  Construct a symmetrical 95% confidence interval for the proportion. Lower Limit =   ZL SE Upper Limit =  + ZU SE The lower and upper z values for a 95% confidence interval are ZL = -1.96 and ZU = and 1.96. Lower Limit = 0.45  1.96 0.995 = 0.255 Upper Limit = 0.45 + 1.96 0.995 = 0.645 Homework Review pp. 365 6, 1-2 sided tests Video: (first 5:45 only) jbstatistics: One-Sided Test or Two-Sided Test?  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