Select True or False from each pull-down menu, depending on whether the corresponding statement is true or false.

? True False  1. In comparing two population means when the samples are dependent, the variable under consideration is $\hat{p}_1-\hat{p}_2$.

? True False  2. Tests in which samples are not independent are referred to as matched pairs.

? True False  3. We can use either the $z-$test ot the $t-$test to determine whether two population variances are equal.

? True False  4. In testing the difference between two population means using two independent samples, we use the pooled variance in estimating the standard error of the sampling distribution of the sample mean difference $\bar{x}_1-\bar{x}_2$ if the populations are normal with equal variances.