1. True or False. Justify for full credit. (a) A is an event, and Ac is the complement of A, then P(A AND Ac) = 0. (b) If the variance of a data set is 0, then all the observations in this data set must be zero. (c) If a 95% confidence interval for a population mean contains... 1, then the 99% confidence interval for the same parameter must contain 1 (d) When plotted on the same graph, a distribution with a mean of 60 and a standard deviation of 5 will look more spread out than a distributionЕще