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Select the best answer for the question. 15. The average length of stay at a popular hotel chain is 4.5 days. A random sample of

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Select the best answer for the question. 15. The average length of stay at a popular hotel chain is 4.5 days. A random sample of 20 hotels in the chain had a mean length of stay of 3.8 days and a standard deviation of 1.2 days. Estimate /, the mean length of stay at all hotels in the chain, with 90% confidence. O A. 3.9 + .645 O B. 2.8 +.664 O C. 3.2 +.464 O D. 3.8 +.464

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