Referring to Table 13-1, interpret the estimate of , the standard deviation of the random error term (standard error of the estimate) in the model.

a) About 95% of the observed service charges fall within $65 of the least squares line. b) About 95% of the observed service charges equal their corresponding predicted values. c) About 95% of the observed service charges fall within $130 of the least squares line. d) For every $1 million increase in sales revenue, we expect a service charge to increase $65