For Exercises 17–20 a confidence interval for is given. Use the confidence interval to test, at level of significance , whether differs from each of the designated hypothesized values.

Question 10.70

19. A 90% confidence interval for is (−10, 10). Hypothesized values are

  1. −10.1
  2. −9.9
  3. 0

10.2.19

(a) . lies outside of the interval (–10, 10), so we reject at the level of significance. (b) . lies inside of the interval (–10, 10), so we do not reject at the level of significance. (c) . lies inside of the interval (–10, 10), so we do not reject at the level of significance.