- 6 7 8 Lower Limit Upper Limit 9 10 11 12 13 14 15 16 An Ecologist Randomly Samples 11 Plants Of A Specific Specie 1 (20.54 KiB) Viewed 44 times
- 6 7 8 Lower Limit Upper Limit 9 10 11 12 13 14 15 16 An Ecologist Randomly Samples 11 Plants Of A Specific Specie 2 (35.48 KiB) Viewed 44 times
✓ 9 - 10 11 = 12 H₁:0 13 14 15 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, μ, 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 greater than last year's mean, which was 2800 miles. The group plans to do a statistical test regarding the value of t. It chooses a random sample of monthly mileages and computes the mean of the sample to be 2975 miles and the standard deviation to be 850 miles. Based on this information, complete the parts below. (a) What are the null hypothesis H, and the alternative hypothesis H, that should be used for the test? 2975 - 16 (b) Suppose that the group decides not to reject the null hypothesis. What sort of error might it be making? Type I (c) Suppose the true mean monthly mileage of cars rented in the U.S. this year is 2800. Fill in the blanks to describe a Type 1 error. A Type I error would be rejecting greater than or equal to the hypothesis that is when, in fact, it is less than 850 H O<O OSO 0>0 020 0-0 0-0 ?