# Question: Dr Mihaela Sabou wants to estimate the average length of

Dr. Mihaela Sabou wants to estimate the average length of a hospital stay (number of days) for patients with a certain infectious disease. From a random sample of 25 patient records, she finds that the average number of days in the hospital for such patients is 6 days, with a standard deviation of 1.8 days.

a. Find the reliability factor for a 95% confidence interval estimate of the population mean length of stay.

b. Find the LCL for a 99% confidence interval estimate of the population mean length of stay.

a. Find the reliability factor for a 95% confidence interval estimate of the population mean length of stay.

b. Find the LCL for a 99% confidence interval estimate of the population mean length of stay.

## Answer to relevant Questions

Suppose that a survey of race fans at this week’s Daytona 500 NASCAR race were asked, Is this your first time attending the Daytona 500? From a random sample of 250 race fans, 100 answered in the affirmative. a. Find the ...Consider the data in Exercise 7.90. It was reported in the local paper that less than one-third (from 23.7% to 32.3%) of the population prefers the online renewal process. What is the confidence level of this interval ...The president’s policy on domestic affairs received a 45% approval rating in a recent poll. The margin of error was given as 0.035. What sample size was used for this poll if we assume a 95% confidence level? Suppose that for a random sample of 200 firms that revalued their fixed assets, the mean ratio of debt to tangible assets was 0.517 and the sample standard deviation was 0.148. For an independent random sample of 400 firms ...Supermarket shoppers were observed and questioned immediately after putting an item in their cart. Of a random sample of 510 choosing a product at the regular price, 320 claimed to check the price before putting the item in ...Post your question