A random sample of n measurements was selected from a population with unknown meanu and standard deviation a 35 for each of the situations a.n= 60, x= 25 b.n= 250, x= 111 c.n= 90, x= 17 d. n= 90, x= 4.79 e. Is the assumption that the underlying population of measurements is normally distributed necessary to ensure the validity of the confidence intervals in parts a through d? Explain. parts a through d. Calculate a 99% confidence interval for u for each of these situations. a. (-11.66. 36.66) (Round to two decimal places as needed.) b. (OD (Round to two decimal places as needed.) (Round to two decimal places as needed.) d. OD

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