Shown Below Is a Portion of the Computer Output for a Regression

Essay

Shown below is a portion of the computer output for a regression analysis relating sales (Y in millions of dollars) and advertising expenditure (X in thousands of dollars).
a. What has been the sample size for the above?
b. Perform a t test and determine whether or not advertising and sales are related. Let $\alpha$ = 0.05.
c. Compute the coefficient of determination.
d. Interpret the meaning of the value of the coefficient of determination that you found in Part c. Be very specific.e. Use the estimated regression equation and predict sales for an advertising expenditure of $4,000. Give your answer in dollars.