51 Construct both a 95% and a 90% confidence interval for b1 for each of the following cases:

a. b n

1 = 31, s = 3, SSxx = 35, n = 12

b. b n

1 = 64, SSE = 1,960, SSxx = 30, n = 18

c. b n

1 = -8.4, SSE = 146, SSxx = 64, n = 24