The waiting times (in minutes) of a random sample of 21 people at a bank have...

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The waiting times (in minutes) of a random sample of 21 people at a bank have a sample standard deviation of 4.7 minutes. Construct a confidence interval for the population variance o and the population standard deviation o. Use a 90% level of confidence. Assume the sample is from a normally distributed population. What is the confidence interval for the population variance o?? OD (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.) O A. With 10% confidence, you can say that the population variance is between O C. With 90% confidence, you can say that the population variance is between and O B. With 10% confidence, you can say that the population variance is greater than and O D. With 90% confidence, you can say that the population variance is less than What is the confidence interval for the population standard deviation o? (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.) O A. With 90% confidence, you can say that the population standard deviation is greater than minutes. O B. With 90% confidence, you can say that the population standard deviation is between and minutes. O C. With 10% confidence, you can say that the population standard deviation is between minutes. minutes and O D. With 10% confidence, you can say that the population standard deviation is less than minutes. The waiting times (in minutes) of a random sample of 21 people at a bank have a sample standard deviation of 4.7 minutes. Construct a confidence interval for the population variance o and the population standard deviation o. Use a 90% level of confidence. Assume the sample is from a normally distributed population. What is the confidence interval for the population variance o?? OD (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.) O A. With 10% confidence, you can say that the population variance is between O C. With 90% confidence, you can say that the population variance is between and O B. With 10% confidence, you can say that the population variance is greater than and O D. With 90% confidence, you can say that the population variance is less than What is the confidence interval for the population standard deviation o? (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.) O A. With 90% confidence, you can say that the population standard deviation is greater than minutes. O B. With 90% confidence, you can say that the population standard deviation is between and minutes. O C. With 10% confidence, you can say that the population standard deviation is between minutes. minutes and O D. With 10% confidence, you can say that the population standard deviation is less than minutes.

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Sample size n21 standard deviation s47 minutes and vari... View the full answer