Refer to Exercises 5 and 7. a. Find the critical value for a 99% confidence interval for

Question:

Refer to Exercises 5 and 7.

a. Find the critical value for a 99% confidence interval for the slope of the true regression line. Then calculate the confidence interval.

b. Interpret the interval from part (a).

c. Explain the meaning of “99% confident” in this context.

Exercises 5 and 7.

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. A least-squares regression analysis was performed on the data using x = number of beers and y = BAC. Here is a residual plot and a histogram of the residuals. Check whether the conditions for performing inference about the regression model are met.

0.05 0.04 - 0.03 0.02 0.01 - 0.00 -0.01 -0.02 -0.03 3 4 6. 7. 8. 9. Number of beers 4 3 --0.03 -0.02 -0.01 0.00 0.01 0.02 0.03 0.04 Residual Residual Frequency 1,