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QUESTION 19 Use the standard normal distribution or the t-distribution construct a 95% confidence interval for the population mean. In a random sample of

QUESTION 19 Use the standard normal distribution or the t-distribution 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. (28744.87, 34697.13) O b. (30000, 33442) Oc. Neither can be used Od. (28378.93, 35063.07)

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