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A telephone service representative believes that the proportion of customers completely satisfied with their local telephone...

A telephone service representative believes that the proportion of customers completely satisfied with their local telephone service is different between the Midwest and the West. The representative's belief is based on the results of a survey. The survey included a random sample of 940 midwestern residents and 1000 western residents. 47% of the midwestern residents and 37% of the western residents reported that they were completely satisfied with their local telephone service. Find the 99% confidence interval for the difference in two proportions.

Find the margin of error. Round your answer to six decimal places.

Math   Statistics-And-Probability   
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Answer #1

1 -----------------------------> midwestern residents

2 -----------------------------> northeastern residents

Refer Standard normal table/Z-table or use excel function "=NORM.S.INV((1-0.005))" to find the Z-value.

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