Homework1Solution

# Homework1Solution - Statistics 102 Fall 2011 Homework 1...

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Statistics 102 – Fall 2011 Homework 1 Solutions (10 Questions Total – 1 Point Each) Problem 2.25: With JMP, we can compute that the sample mean =28.15 and the standard deviation is s =6.53, and thus the 95% CI of the mean miles per gallon is Problem 2.30: H 0 : µ 27.5 H a : µ > 27.5 Decision Rule: Reject if , do not reject if Test statistic: Decision: Do not reject . We do not have enough evidence to conclude that the CAFE standard is being met under the 5% level of significance. Problem 2.28, H0: µ 5 H1: µ < 5 Decision Rule: Reject if , do not reject if Test statistic: Decision: Reject .

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Under the 5% level of significance, the FTC has grounds to proceed against the manufacturer for the unfair practice of short-weight selling. Problem 2.32: Since , we can Assume that the two groups’ GMAT scores have the same standard deviation, then So the 95% CI of the difference between the mean GMAT scores is Problem 2.35: (1) If using the un-pooled procedure the result of JMP is t Test No Load-Load Assuming unequal variances Difference 5.063 t Ratio 1.121621 Std Err Dif
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Homework1Solution - Statistics 102 Fall 2011 Homework 1...

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