A firm that prints automobile bumper stickers conducts a study to investigate the relation between the direct cost of producing an order of bumper stickers (TOTCOST) and the number of stickers (RunSize, in 1,000s of stickers) in a particular order. The data are given in the following table.
a. Plot a scatterplot of the data. Do you detect any difficulties with using a ­linear regression model? Can you find any blatant violations of the regression ­assumptions?
b. Compute the estimated regression line.
c. Estimate the residual standard deviation.
d. Construct a 95% confidence interval for the true slope.
e. What are the interpretations of the intercept and slope in this study?

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