Difference of two Means. A national testing agency decided to do an experiment to see about the value of using a computer in a mathematics class. One group of students (Group A) used a computer in their class, while another group (Group B) did not. The main variable of interest was a test score, and we want to see if the mean test score for Group A is Larger than Group B. Use alpha = .05 for your test.

The sample statistics are given below for each group.

Group A Group B
Mean Score 320 302
Standard Deviation 29.5 32.1
N 20 20
We can assume the two variances are equal. Based on the results of a hypothesis test, your conclusion would be to:

a. Fal to reject the Null Hypothesis that the mean Means are equal.

b. Reject the Null Hypothesis that the mean Means are equal.