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(b) Estimate the sample size needed if no estimate of, is available. A sample of adults is needed to obtain a 98% confidence interval with a margin of error of 0.05. X Ś

(b) Estimate the sample size needed if no estimate of, is available. A sample of adults is needed to obtain a 98% confidence interval with a margin of error of 0.05. X Ś

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter4: Equations Of Linear Functions
Section: Chapter Questions
Problem 8SGR
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Question
Estimate the sample size needed if no estimate of p is available. PART B
How's the economy? A pollster wants to construct a 98% confidence interval for the proportion of adults who believe that economic conditions are getting better. Part 1 of 2 (a) A poll taken in July 2010 estimates this proportion to be 0.27. Using this estimate, what sample size is needed so that the confidence interval will have a margin of error of 0.05? A sample of 427 adults is needed to obtain a 98% confidence interval with a margin of error of 0.05. Part: 1 / 2 Part 2 of 2 (b) Estimate the sample size needed if no estimate of, is available. A sample of adults is needed to obtain a 98% confidence interval with a margin of error of 0.05. Ś
Transcribed Image Text:How's the economy? A pollster wants to construct a 98% confidence interval for the proportion of adults who believe that economic conditions are getting better. Part 1 of 2 (a) A poll taken in July 2010 estimates this proportion to be 0.27. Using this estimate, what sample size is needed so that the confidence interval will have a margin of error of 0.05? A sample of 427 adults is needed to obtain a 98% confidence interval with a margin of error of 0.05. Part: 1 / 2 Part 2 of 2 (b) Estimate the sample size needed if no estimate of, is available. A sample of adults is needed to obtain a 98% confidence interval with a margin of error of 0.05. Ś
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