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# Confidence Interval, Prediction Interval

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The Zebra Wild Game Company sells exotic game to high end restaurants throughout Asia. The sales manager wants to determine what, if any, relationship exists between the pounds/week of game sold by 24 sales persons and the advertising dollars spent (in hundreds of dollars/week).

Attached is the MegaStat regression output. The dependent variable is Sales (in pounds/week) and the independent variable is Advertising (in hundreds of dollars/week).

Use the MegaStat output to identify and interpret the confidence and prediction intervals for an advertising expenditure of two hundred dollars.

For an advertising expenditure of \$200, the 95% confidence interval: [ , ]

Interpretation of the 95% confidence interval:

A. This says we are 95% confident that any particular sales person, with \$200 in advertising expenditures, will show sales between these values.

B. This says we are 95% confident that, in the population, advertising expenditures between these values will result in an average of \$200 additional sales.

C. This says we are 95% confident that across many sales persons with advertising expenditures of \$200, their mean sales will be between these values.

D. This says we are 95% confident that each additional \$100 in advertising expenditures will result in sales between these values.

E. This has no practical interpretation in this problem situation

For an advertising expenditure of \$200, the 95% prediction interval: [ , ]

For 5 years of experience, the 95% prediction interval:

A. This says we are 95% confident that any particular sales person, with \$200 in advertising expenditures, will show sales between these values.

B. This says we are 95% confident that, in the population, advertising expenditures between these values will result in an average of \$200 additional sales.

C. This says we are 95% confident that across many sales persons with advertising expenditures of \$200, their mean sales will be between these values.

D. This says we are 95% confident that each additional \$100 in advertising expenditures will result in sales between these values.

E. This has no practical interpretation in this problem situation