Industry automobile sales should be related to consumer sentiment. The following table provides a regression analysis in which sales of automobiles and light trucks (in millions of vehicles) are estimated as a function of a consumer sentiment index.
Regression Statistics
Multiple R………………….0.80113
R-squared…………………..0.64181
Standard error………………0.81325
Observations………………..120
For the independent variable and dependent variable, the means, standard deviations, and variances are as follows:
A. Find the expected sales and a 95 percent prediction interval for sales if the sentiment index has a value of 90.
B. Find the expected sales and a 95 percent prediction interval for sales if the sentiment index has a value of 100.
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