Two independent samples of sizes 30 and 35 are randomly selected from two normal populations with equal variances. Which of the following is the test statistic that should be used to test the difference between the population means?
A)Student t with 64 degrees of freedom.
B)Chi-square
C)Z
D)Student t with 63 degrees of freedom.

Question

Quizplus · Accepted Answer

The correct test statistic for comparing the means of two independent samples from normal populations with equal variances is the Student t-test. The degrees of freedom for this test are calculated as the sum of the sample sizes minus 2 (30 + 35 - 2 = 63).

Two Independent Samples of Sizes 30 and 35 Are Randomly