=+a) What do the displays say about the influence of these two cereals on this regression? (The histogram is of the Studentized residuals.)

Here’s another regression with dummy variables defined for each of the two bran cereals.

Dependent variable is: Calories R-squared = 50.7% R-squared (adjusted) = 47.3%

s = 14.15 with 77 - 6 = 71 degrees of freedom Variable Coeff SE(Coeff) t-ratio P-value Intercept 79.0874 4.839 16.3 60.0001 Sodium 0.068341 0.0198 3.46 0.0009 Potassium 0.043063 0.0272 1.58 0.1177 Sugar 2.03202 0.3795 5.35 60.0001 All-Bran -50.7963 15.84 -3.21 0.0020 All-Bran Extra -52.8659 16.03 -3.30 0.0015