# Question

The following partial MINITAB regression output for the Fresh detergent data relates to predicting demand for future sales periods in which the price difference will be .10 (see New Obs 1) and .25 (see New Obs 2).

a. Report (as shown on the computer output) a point estimate of and a 95 percent confidence interval for the mean demand for Fresh in all sales periods when the price difference is .10.

b. Report (as shown on the computer output) a point prediction of and a 95 percent prediction interval for the demand for Fresh in an individual sales period when the price difference is .10.

c. Remembering that s = .316561 and that the distance value equals (sy/s)2, use from the computer output to hand calculate the distance value when x .10.

d. For this case: n = 30, b0 = 7.81409, b1 = 2.6652, and s = .316561. Using this information, and your result from part c, find 99 percent confidence and prediction intervals for mean and individual demands when x = .10.

e. Repeat parts a, b, c, and d when x = .25.

a. Report (as shown on the computer output) a point estimate of and a 95 percent confidence interval for the mean demand for Fresh in all sales periods when the price difference is .10.

b. Report (as shown on the computer output) a point prediction of and a 95 percent prediction interval for the demand for Fresh in an individual sales period when the price difference is .10.

c. Remembering that s = .316561 and that the distance value equals (sy/s)2, use from the computer output to hand calculate the distance value when x .10.

d. For this case: n = 30, b0 = 7.81409, b1 = 2.6652, and s = .316561. Using this information, and your result from part c, find 99 percent confidence and prediction intervals for mean and individual demands when x = .10.

e. Repeat parts a, b, c, and d when x = .25.

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