In 2010, an online security firm estimated that 64% of computer users don't change their passwords very often. Because this estimate may be outdated, suppose that you want to carry out a new survey to estimate the proportion of students at your school who do not change their password. You would like to determine the sample size required to estimate this proportion to within a margin of error of 0.04 with 95% confidence. (a) Using 0.64 as a preliminary estimate, what is the required sample size if you want to estimate this proportion with a margin of error of 0.04? (Round your answer up to the nearest whole number.) Calculate the required sample size using the conservative value of 0.5. (Round your answer up to the nearest whole number.) How do the two sample sizes compare? The sample size calculated using 0.64 is --Select--- - the sample size calculated using the conservative estimate. (b) What sample size would you recommend? Justify your answer. The --Select-- v should be used for this study because it will guarantee a margin of error of no greater than 0.04. The other sample size calculated will only guarantee a margin of error no greater than 0.04 if p > or if p <

In 2010, an online security firm estimated that 64% of computer users don't change their passwords very often. Because this estimate may be outdated, suppose that you want to carry out a new survey to estimate the proportion of students at your school who do not change their password. You would like to determine the sample size required to estimate this proportion to within a margin of error of 0.04 with 95% confidence. (a) Using 0.64 as a preliminary estimate, what is the required sample size if you want to estimate this proportion with a margin of error of 0.04? (Round your answer up to the nearest whole number.) Calculate the required sample size using the conservative value of 0.5. (Round your answer up to the nearest whole number.) How do the two sample sizes compare? The sample size calculated using 0.64 is --Select--- - the sample size calculated using the conservative estimate. (b) What sample size would you recommend? Justify your answer. The --Select-- v should be used for this study because it will guarantee a margin of error of no greater than 0.04. The other sample size calculated will only guarantee a margin of error no greater than 0.04 if p > or if p <

Holt Mcdougal Larson Pre-algebra: Student Edition 2012

1st Edition

ISBN:9780547587776

Author:HOLT MCDOUGAL

Publisher:HOLT MCDOUGAL

Chapter11: Data Analysis And Probability

Section11.4: Collecting Data

Problem 2E

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