Question: Use the standard normal distribution = or the t-distribution E-construct a 95% confidence interval for the population mean. In a random sample of 12

Use the standard normal distribution = or the t-distribution E-construct a 95% confidence interval for the population mean. In a random sample of 12 dental assistants, the mean annual earnings was $31,721 and the sample standard deviation was $5260. The annual earnings are normally distributed. O a. (28378.93, 35063.07) O b. (28744.87, 34697.13) Oc. (30000, 33442) Od. Neither can be used QUESTION 21 Use the standard normal distribution = or the t-distribution E=t+construct a 95% confidence interval for the population mean if applicable. In a random sample of 13 people, the mean length of stay at a hospital was 6.5 days. Assume the population standard deviation is 1.7 days. The lengths of stay are not normally distributed. a. (5.58, 7.42) Ob. (4.32, 8.68) c. (6, 7) Od. neither can be used

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