Use the data of question 47 and the answers of questions 47 and 48 to predict y if x₁ = 7.5 and x₂ = 6.5. In addition, please also calculate 95% confidence interval and 95 % prediction interval.

Question 47

You are given the following information:

(a) Compute the least-squares estimate for intercept and slopes

(b) Compute the t-values for slopes b₁ and b₂ 

Question 48

Use the data from question 47 to compute

(a) R²

(b) Adjusted R²

(c) F statistics

Transcribed Image Text:

Cov (y,x) = 65, Var (x) = 4.5 Var (x) = 4.2 Cov (x1, x2) = 3.2 Var (y) = 2,500 Cov (y, x) = 3.8 Mean of y = 80 (x - x) = 40 (x-x) = 35 Se = 48 n = 30 Mean of x = 7 Mean of x = 6