## Statistics 200 If The Variance Of A Data Set Is 0, Then All The

True or False, and please explain(A) = 0. 4, P(B) = 0. 5, and A and B are independent, then P(A AND B) = 0. 2. (b) If the variance of a data set is 0, then all the observations in this data set must be zero. (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.

## STATISTICS 200 If the variance of a data set is 0, then all the

Question

True or False, and please explain

(A) = 0.4, P(B) = 0.5, and A and B are independent, then P(A AND B) = 0.2.

(b) If the variance of a data set is 0, then all the observations in this data set must be zero.

(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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