Introductory Statistics 9th Edition

Published by Wiley
ISBN 10: 1-11905-571-7
ISBN 13: 978-1-11905-571-6

Chapter 8 - Section 8.2 - Estimation of a Population Mean: σ Known - Exercises - Page 322: 8.4

Answer

To decrease the width of a confidence interval, we can lower the confidence level and increase the sample size. To increase the sample size is the best alternative. This is because lowering the confidence level may give less reliable results. Therefore, we should always prefer to increase the sample size.

Work Step by Step

To decrease the width of a confidence interval, we can lower the confidence level and increase the sample size. To increase the sample size is the best alternative. This is because lowering the confidence level may give less reliable results. Therefore, we should always prefer to increase the sample size.
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