Question: 28. Refer to Problem 27. Assuming that a linear regression model is appropriate. (a) Find a 95% prediction interval for Y when X = 150

28. Refer to Problem 27. Assuming that a linear regression model is appropriate.

(a) Find a 95% prediction interval for Y when X = 150 mg.

(b) Find a 95% confidence interval for E(Y |X) when X = 150 mg.

(c) Compare the confidence interval in

(b) with the prediction interval in

(a) and indicate which one is larger.

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