A firm that prints automobile bumper stickers investigates the relation between the total...

A firm that prints automobile bumper stickers investigates the relation between the total direct cost of a lot of stickers and the number produced in the printing run. The data are analyzed by the Execustat computer package. The relevant output is as follows:

a. Plot the data. Do you detect any difficulties with using a linear regression model? Can you see any blatant violations of assumptions? The raw data are as follows:

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b. Write the estimated regression equation indicated in the output. Find the residual standard deviation.

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c. Calculate a 95% confidence interval for the true slope. What are the interpretations of the intercept and slope in this problem?