Consider the following set of dependent and independent variables. Use these data to complete parts a and b below.

y x1 x2

45 21 71

42 31 61

38 19 76

38 15 53

26 14 44

23 18 49

19 7 35

15 12 19

6 8 16

a. Construct a 90% confidence interval for the regression coefficient for x1 and interpret its meaning.

The 90% confidence interval for the true population coefficient 1 is to.