For Exercises 19–22, follow these steps. Assume that the regression model assumptions are valid.

  1. Calculate .
  2. Compute .
  3. Calculate .
  4. Find .
  5. Perform the hypothesis test for the linear relationship between and using the -value method and level of significance .

Question 13.21

21. Data in Exercise 13, where

13.1.21

(a) (b) (c)

(d) (e) : There is no linear relationship between and . : There is a linear relationship between and . Reject if -value . Since -value , we reject . There is evidence at level of significance that and that there is a linear relationship between and .