# Stats 200 Common final (True false)

**Tutor description**

True or False. Justify for full credit. (a) If P(A) = 0.4, P(B) = 0.5, and A and B are independent, then P(A AND B) = 0.2. (b) If all the observations in a data set are identical, then the variance of this data set is 0. (c) The mean is always equal to the median for a normal distribution. (d) A 90% confidence interval is wider than a 95% confidence interval of the same parameter. (e) In a right-tailed test, the value of the test statistic is 2. The test statistic follows a distribution with the distribution curve shown below. If we know the shaded area is 0.96, then we have sufficient evidence to reject the null hypothesis at 0.05 level of significance.

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