Access the data, labeled BMI_Salary, from the text website to estimate a regression model using the salary of a college-educated worker as the response variable and BMI and Race as the two explanatory variables. Race is a dummy variable that equals 1 if white and 0 if non-white.

a. Construct and interpret the 90% confidence interval for the mean salary of a white, college-educated worker with a BMI of 30.

b. Construct and interpret the 90% prediction interval for the individual salary of a white, college-educated worker with a BMI of 30.