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Statistics Exam 2 Answers

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1. Select correct answer for each of the following questions with analysis or simple calculation. (25 points) (A) What do we hope to capture within a confidence interval? a) The unknown confidence l ... evel. b) The unknown parameter µ. c) The unknown statistic x . d) The margin of error (B) Suppose in a test of hypotheses, data are proved to be significant at level  = 0.05, but not significant at level  = 0.01. Which of the following is true about the P-value P, associated with this test? a) P > 0.05 b) P < 0.05 c) 0.01 < P < 0.05 d) P < 0.01 (C) You plan to construct a 99% confidence interval for the mean  of a Normal population with (known) standard deviation . By using a sample size of 400 rather than 100, you can reduce the margin of error by a factor of a) 2 (the new margin of error will be half that of the one based on 100 observations). b) 4 (the new margin of error will be 1/4 that of the one based on 100 observations). c) 16 (the new margin of error will be 1/16 that of the one based on 100 observations). m2/m1 = (Z* √400 (Z* √100  √100  √400  (D) Let X be the number of girls in a family of 3 children. What is the probability that the family has either one or two girls? X 0 1 2 3 Probability 0.125 [Show More]

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