MATH 221 Week 8 Final Exam.( ALL CORRECT ANSWERS)

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MATH 221 Week 8 Final Exam.( ALL CORRECT ANSWERS)Answer 1: 108.19, 113.81 B. The n =55 confidence interval is wider because a smaller sample is taken, giving less information about the population. ... Answer 2: a) N = 3908 b) N = 4147 Answer 3: Option B is correct. The standardized test statistic is 2.68 P-value is 0.006 Option A is correct. Answer 4: Option D is correct. (Stratified) Answer 5: (a) 0.121 (b) 0.815 (c) 0.064 Answer 6: Option D is correct. (Ordinal) Answer 7: 0.2700 Answer 8: a) 16 b) 62 A population standard deviation of 0.40 in. requires a larger sample size. Due to increased variability in the proportion, a larger sample size is needed to ensure the desired accuracy. Answer 9: (a) Option E is correct. (b) 0.195 (c) Option A is correct. (d) Option A is correct. Answer 10: a) 0.2525 b) 0.1613 c) 0.0478 d) Option B is correct. Answer 11: Option B is correct. The critical value is -2.33 z = -0.57 Option D is correct. Answer 12: a) 0.460 b) 0.762 c) 0.589 d) 0.922 e) Option D is correct. [Show More]

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