A consumer advocacy group is doing a large study on car rental practices Among other things the consumer group would like to do

Question

A consumer advocacy group is doing a large study on car rental practices Among other things the consumer group would like to do a statistical test regarding the mean monthly mileage of cars rented in the U S this year The consumer group has good reason to believe that the mean monthly mileage of cars rented in the U S this year is less than last year s mean which was 2700 miles The group plans to do a statistical test regarding the value of It chooses a random sample of monthly mileages and computes the mean of the sample to be 2565 miles and the standard deviation to be 700 miles Based on this information complete the parts below a What are the null hypothesis Ho and the alternative hypothesis H that should be used for the test Ho b Suppose that the group decides not to reject the null hypothesis What sort of error might it be making Type I Type II c Suppose the true mean monthly mileage of cars rented in the U S this year is 2550 Fill in the blanks to describe a Type II error A Type II error would be rejecting failing to reject the hypothesis that u is less than less than or equal to greater than greater than or equal to not equal to 2565 2700 700 when in fact u is equal to 700 equal to 2700 equal to less than 700 less than 2700 greater than 2565 greater than 2700

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