## Essentials of Statistics (5th Edition)

Published by Pearson

# Chapter 7 - Estimates and Sample Sizes - 7-3 Estimating a Population Mean: 1

#### Answer

a) $\mu$ is between 233.4sec and 256.65 sec. b) The best point estimate is 245.025 and the margin of error is 11.625.

#### Work Step by Step

a) According to the screen the confidence interval is (233.4,256.65), which is: $\mu$ is between 233.4sec and 256.65 sec. b) The best point estimate of $\mu$ according to the screen is 245.025 and the margin of error is:$\frac{upper \ confidence \ limit-lower \ confidence \ limit}{2}=\frac{256.65-233.34}{2}=11.625$

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