Rodriguez Marshall
05/02/2023 · Senior High School

The waiting times (in minutes) of a random sample of 20 people at a bank have a sample standard deviation of 4.1 minutes. Construct a confidence interval for the population variance \( \sigma^{2} \) and the population standard deviation \( \sigma \). Use a \( 95 \% \) level of confidence. Assume the sample is from a normally distributed population. What is the confidence interval for the population variance \( \sigma^{2} \) ? (Round to one decimal place as needed.) Interpret the results. Select the correct choice below and fill in the answer box(es) to complete your choice. (Round to one decimal place as needed.)

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The confidence interval for the population variance \( \sigma^{2} \) is \( (10.6, 31.6) \).

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