A telephone service representative believes that the proportion of customers completely satisfied with their local telephone service is different between the South and the Midwest. The representative's belief is based on the results of a survey. The survey included a random sample of 580580 southern residents and 680680 midwestern residents. 52%52% of the southern residents and 40%40% of the midwestern residents reported that they were completely satisfied with their local telephone service. Find the 90%90% confidence interval for the difference in two proportions. Step 1 of 3 : Find the critical value that should be used in constructing the confidence interval.
A telephone service representative believes that the proportion of customers completely satisfied with their local telephone service is different between the South and the Midwest. The representative's belief is based on the results of a survey. The survey included a random sample of 580580 southern residents and 680680 midwestern residents. 52%52% of the southern residents and 40%40% of the midwestern residents reported that they were completely satisfied with their local telephone service. Find the 90%90% confidence interval for the difference in two proportions. Step 1 of 3 : Find the critical value that should be used in constructing the confidence interval.
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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A telephone service representative believes that the proportion of customers completely satisfied with their local telephone service is different between the South and the Midwest. The representative's belief is based on the results of a survey. The survey included a random sample of 580580 southern residents and 680680 midwestern residents. 52%52% of the southern residents and 40%40% of the midwestern residents reported that they were completely satisfied with their local telephone service. Find the 90%90% confidence interval for the difference in two proportions.
Step 1 of 3 :
Find the critical value that should be used in constructing the confidence interval.
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