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Use the standard normal distribution or the t-distribution to construct a 95% confidence interval for the population mean. Justify your decision. If neither distribution can be used, explain why. Interpret the results. In a random sample of 14 people, the mean length of stay at a hospital was 7.6 days. Assume the population standard deviation is 1.9 days and the lengths of stay are normally distributed. Which distribution should be used to construct the confidence interval? Al Use a normal distribution because the lengths are normally distributed and o is known. B. Use a normal distribution because n = 30 C. Use a t-distribution because n