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Refer to Problems 11 and 12 a Find a point

Refer to Problems 11 and 12.

a. Find a point estimate for the mean graduation rate of all universities that have a student-to-faculty ratio of 17.

b. Determine a 95% confidence interval for the mean graduation rate of all universities that have a student-to-faculty ratio of 17.

c. Find the predicted graduation rate for a university that has a student-to-faculty ratio of 17.

d. Find a 95% prediction interval for the graduation rate of a university that has a student-to-faculty ratio of 17.

e. Explain why the prediction interval in part (d) is wider than the confidence interval in part (b).

Presume that the variables student-to faculty ratio and graduation rate satisfy the assumptions for regression inferences.

a. Find a point estimate for the mean graduation rate of all universities that have a student-to-faculty ratio of 17.

b. Determine a 95% confidence interval for the mean graduation rate of all universities that have a student-to-faculty ratio of 17.

c. Find the predicted graduation rate for a university that has a student-to-faculty ratio of 17.

d. Find a 95% prediction interval for the graduation rate of a university that has a student-to-faculty ratio of 17.

e. Explain why the prediction interval in part (d) is wider than the confidence interval in part (b).

Presume that the variables student-to faculty ratio and graduation rate satisfy the assumptions for regression inferences.

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