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Statistics Practice Test: answer key

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#AnswerLessonSolution
1D 1.7Random variablesSolved step by step
2D 3.1Random variablesSolved step by step
32.25Random variablesSolved step by step
4C 0.1804The Poisson distributionSolved step by step
5B 0.1494The Poisson distributionSolved step by step
6P(X ≤ 2) ≈ 0.5438The Poisson distributionSolved step by step
7C 0.1280The geometric distributionSolved step by step
8A P(X = 4) ≈ 0.0965The geometric distributionSolved step by step
920The geometric distributionSolved step by step
10C P(X < 60) = 0.8413Normal probabilities with the z-tableSolved step by step
11A 0.7745Normal probabilities with the z-tableSolved step by step
12P(X < 480) = 0.2119Normal probabilities with the z-tableSolved step by step
13D 62.8Normal cut-offsSolved step by step
14B 119.6Normal cut-offsSolved step by step
1545.6Normal cut-offsSolved step by step
16C 0.0668Sample means and the central limit theoremSolved step by step
17B 0.0228Sample means and the central limit theoremSolved step by step
180.0228Sample means and the central limit theoremSolved step by step
19A (48.04, 51.96)Confidence interval for a meanSolved step by step
20B (62.54, 66.46)Confidence interval for a meanSolved step by step
21(5.0483, 6.1517)Confidence interval for a meanSolved step by step
22(45.738, 54.262)Confidence interval with tSolved step by step
23(88.416, 111.584)Confidence interval with tSolved step by step
24(7.9837, 10.0163)Confidence interval with tSolved step by step
25(0.2551, 0.3449)Confidence interval for a proportionSolved step by step
26(0.2627, 0.3373)Confidence interval for a proportionSolved step by step
27(0.4713, 0.5287)Confidence interval for a proportionSolved step by step
28A n = 217How big a sample?Solved step by step
29B n = 62How big a sample?Solved step by step
30n = 2401How big a sample?Solved step by step

Grade

Count your right answers and divide by the number of questions: A 90% or more, B 80%, C 70%, D 60%, F below 60%.