How large a sample should you take to be 95% confident that the estimate of the true mean numberof hours of sleep among adults will differ by no more than 0.30? A previous study showed a samplestandard deviation of 1.95 minutes.Aat most 136B at least 136C) at most 163at least 163

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A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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The WAIS is an IQ test. Scores on the WAIS for the 20-34 age group are normally distributed with a mean 110 and a standard deviation of 25. Scores for the 60-64 age group are normally distributed with a mean of 90 and a standard deviation of 25. Find the percent of 20-34-year-olds that have an IQ greater than 120. a. 16% b. z= 0.4 or 40% c. 0.6554 or 65.54% d. 0.3446 or 34.46%
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How large a sample should you take to be 95% confident that the estimate of the true mean number of hours of sleep among adults will differ by no more than 0.30? A previous study showed a sample standard deviation of 1.95 minutes. at most 136 B at least 136 C at most 163 D at least 163