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