# Question: A firm that prints automobile bumper stickers conducts a study

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?

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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