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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RunSize 26.0 10.0 2.0 8 4.0 2.508 10 TOTCOST 230 34 629 187 159 327 206 124 155 147 RunSize 2.03.045 5.0 20.0 5.02010 15 TOTCOST 209 247 135 125 366 1,146 339 208 150 179 RunSize TOTCOST 128 143 131 219 1 258 415 226 159 5 10 0 62.0 15 3.0 6.52. 1.0