INTRODUCTION TO STATISTICS & DATA ANALYS
6th Edition
ISBN: 9780357420447
Author: PECK
Publisher: CENGAGE L
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Textbook Question
Chapter 9.2, Problem 35E
In 2010, the online security firm Symantec estimated that 63% of computer users don’t change their passwords very often (cnet.com/news/survey-63-dont-change-passwords-very-often, retrieved November 19, 2016). Suppose that you want to carry out a new survey to estimate the proportion of students at your school who do not change their password.
- a. What is the required
sample size if you want to estimate this proportion with a margin of error of 0.05? Calculate the required sample size first using 0.63 as a preliminary estimate of p and then using the conservative value of 0.5. How do the two sample sizes compare? - b. What sample size would you recommend? Justify your answer.
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