Statistics Final Review Chapters 7,8,9

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1. STAT10T 7.2.1-2 (Points: 5.0) Solve the problem. Find the critical value zα/2 that corresponds to a degree of confidence of 91%. a. 1.645 b. 1.75 c. 1.34 d. 1.70 2. STAT10T 7.2.3-2 (Points: 5.0) Solve the problem. The following confidence interval is obtained for a population proportion, p: 0.817 < p < 0.855 Use these confidence interval limits to find the point estimate, . a. 0.833 b. 0.817 c. 0.839 d. 0.836 3. STAT10T 7.2.4-3 (Points: 5.0) Find the margin of error for the 95% confidence interval used to estimate the population proportion. In a survey of 7100 T.V. viewers, 40% said they watch network news programs. a. 0.0131 b. 0.0150 c. 0.0114 d. 0.00855 4.…show more content…
The test statistic in a two-tailed test is z = 1.95. a. 0.4423 b. 0.0244 c. 0.0512 d. 0.3415 19. STAT10T 8.2.3-3 (Points: 5.0) Assume that the data has a normal distribution and the number of observations is greater than fifty. Find the critical z value used to test a null hypothesis. α = 0.05 for a left-tailed test. a. ±1.645 b. ±1.96 c. -1.96 d. -1.645 20. STAT10T 7.2.3-4 (Points: 5.0) Solve the problem. The following confidence interval is obtained for a population proportion, p: (0.293, 0.317) Use these confidence interval limits to find the margin of error, E. a. 0.010 b. 0.012 c. 0.013 d.

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