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Answers to previous tests. For Fall 2009 (including H1 sentences you will need to write). Test 2 2008 1. omit..this was covered in Test 1. 2.a n = 1068 people b. smaller, because 0.25 is the maximum value of (p-hat)(q-hat) 3. paired formulas, mu_d = 0, mu_d >0 There is a reduction in waist size after taking the class. right tailed diagram test statistic = 0.932, df = 5, P value is greater than 0.5, alpha = 5%, therefore do not reject, and there is no reduction in waist size. 4a omit , conf intervals for difference of proportions is no longer in the course. 4b. shorter 4c. omit 4d. two tailed diagram, test statistic on edge of shading 4e. Reject, P value = 0.4%, alpha = 1%, P< alpha 4f. iv 5. E = zc sigma/( sqrt n).. middle sentence applies to population so it is not s ‘t’ formula. CI is 99.91 to 116.1 g. 6. 1 sample-t formula Ho: mu = 90, H1: mu < 90, the mean stride length is less than 90 cm. left tailed diagram t = -2.28, Pvalue between 1% and 2.5% alpha = 5%, reject Ho therefore mean stride length is less than 90 cm.

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