A researcher randomly sampled 30 graduates,18 males and 12 females,of an MBA program and recorded data concerning their starting salaries.Of primary interest to the researcher was the effect of gender on starting salaries.Statistics of the mean salaries of the females and males in the sample were computed.The sample standard deviations suggest that the variability of starting salaries of the two groups is almost the same.Suppose the starting salaries from both groups can be considered as normally distributed.Which of the following tests will be the most appropriate?
A)Pooled-variance t test.
B)Separate-variance t test.
C)Paired t test.
D)Wilcoxon rank sum test.

Question

Quizplus · Accepted Answer

Pooled-variance t test is appropriate when the sample standard deviations are approximately equal and the distribution is normal. In this case, the standard deviations of the two groups are almost the same and it is stated that the starting salaries can be considered as normally distributed. Therefore, a pooled-variance t test is the most appropriate choice.

A Researcher Randomly Sampled 30 Graduates,18 Males and 12 Females,of