A random sample of n measurements was selected from a population with unknown mean p 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 = 29 b. n = 150, x = 118 c. n = 80, x = 13 d. n = 80, x =5.25 a. (p (Round to two decimal places as needed. ) b. (p (Round to two decimal places as needed.) c. 0 (Round to two decimal places as needed.) d. D (Round to two decimal places as needed. ) e. Since we are given o= 30 we should use the standard normal distribution to get the critical value here, TRUE or FALSE? O True O False