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 distribution 更多
