4. A two-sample study for the difference between two population means will utilize t-test procedures and is to be done at the 0.05 level of significance. The sample sizes are 23 and 27. The variances...

Extracted text: 4. A two-sample study for the difference between two population means will utilize t-test procedures and is to be done at the 0.05 level of significance. The sample sizes are 23 and 27. The variances are 18 and 36, respectively. What is (a) the alternative hypothesis is one-sided, and you assume that the population variances are the upper critical value t, for the rejection region if unequal? (b) the alternative hypothesis is two-sided, and you assume that the population variances are unequal? (c) the alternative hypothesis is one-sided and you assume that the population variances are equal? (d) the alternative hypothesis is two-sided, and you assume that the population variances are equal?