Subaru Motors records on the entire production of 2007 Outba

Subaru Motors\' records on the entire production of 2007 Outbacks reveal that the average number of months before a major repair is normally distributed with a population mean of 60 months. Austin Subaru purchased 36 Outbacks and found that the sample\'s average months to a major repair was 64; the sample standard deviation was 5 months. Suppose you are interested whether the sample mean is different from the mean of the company

Solution

Answer: D. It will decrease the estimated standard error and decrease the likelihood of rejecting H0.

Because the test statistic is decreasing and it decrease he likelihood of rejecting H0.