# Confidence interval

You are constructing a 95% confidence interval using the information: n = 60, = 65.5, s = 2.5, and E = 0.7. What is the value of the middle of the interval?

A. 0.7

B. 2.5

C. 0.95

D. 65.5

What sample size would be needed to estimate the population mean to within one-half standard deviation with 95% confidence?

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#### Solution Summary

Step by step method for the construction of confidence interval is included in the answer.

$2.19