Beer and BA C How well does the number of beers a person drinks predict his or her blood alcohol content (BAC)? Sixteen volunteers aged 21 or older with an initial BAC of 0 took part in a study to find out. Each volunteer drank a randomly assigned number of cans of beer. Thirty minutes later, a police officer measured their BAC. Least-squares regression was performed on the data. A residual plot and a histogram of the residuals are shown below. Check whether the conditions for performing inference about the regression model are met.

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Residual 0.05- 0.04 0.03- 0.02- 0.01- : 0.00- -0.01- -0.02- -0.03- 01 2 3 45 6 7 8 9 Beers