Randomly selected 15 student cars have ages with a mean of 7.4 years and a standard deviation of 3.6 years, while randomly selected 30 faculty cars have ages with a mean of 5.4 years and a standard deviation of 3.5 years. 1. Use a 0.01 significance level to test the claim that student cars are older than faculty cars. (a) The test statistic is __________ (b) The critical value is __________ (c) Is there sufficient evidence to support the claim that student cars are older than faculty cars? A. Yes B. No 2. Construct a 99 % confidence interval estimate of the difference μs−μf, where μs is the mean age of student cars and μf is the mean age of faculty cars. ____________<(μs−μf)<___________

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Randomly selected 15 student cars have ages with a mean of 7.4 years and a standard deviation of 3.6 years, while randomly selected 30 faculty cars have ages with a mean of 5.4 years and a standard deviation of 3.5 years.

1. Use a 0.01 significance level to test the claim that student cars are older than faculty cars.

(a) The test statistic is __________

(b) The critical value is __________

(c) Is there sufficient evidence to support the claim that student cars are older than faculty cars?

A. Yes
B. No


2. Construct a 99 % confidence interval estimate of the difference μs−μf, where μs is the mean age of student cars and μf is the mean age of faculty cars.
____________<(μs−μf)<___________

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