1. The value of ?" required for a 70% confidence interval is (a) -0.5244 (b) 1.036 (c) 0.5244 (d) 0.6179 (e) The answer can't be determined from the information given. (f) None of the above. The answer is 2. A 95% confidence interval for the mean or of a population is computed from a random sample and found to be 9 1 3. We may conclude that (a) There is a 95%% probability that # is between 6 and 12. (b] There is a 95% probability that the true mean is 9 and a 95% chance the true margin of error is 3. (c) If we took many, many additional random samples and from each computed a 95% confidence interval for a, approximately 95% of these intervals would contain w. (d) If we took many, many additional random samples and from each computed a 95%% confidence interval for w, 95% of them would cover the values from 6 to 12. (e) All of the above. 3. A 95% confidence interval for the mean reading achievement score for a population of third grade students is (44.2, 54.2). Suppose you compute a 99%% confidence interval using the same information. Which of the following statements is correct? (a) The intervals have the same width. (b) The 99% interval is shorter. (c) The 99%% interval is longer. (d) The answer can't be determined from the information given. (e) None of the above. The answer Is