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A random sample of n measurements was selected from a population with unknown mean u and standard deviation o = 30 for each of the situations in parts a through d. Calculate a 95% confidence interval for u for each of these situations. a. n = 60, x = 22 b. n = 150, x = 101 c. n = 80, x = 17 d. n = 80, x = 5.55 a. () (Round to two decimal places as needed.) b. () (Round to two decimal places as needed.) c. ( ) (Round to two decimal places as needed.) d. (0 (Round to two decimal p I places as needed.)3. Since we are given 0= 30 we should use the standard normal distribution to gel the critical value here. TRUE or FALSE? 0 True 0 False