The experimental difference of the means is ---%?

Question

A randomized comparative experiment tests whether listening to music between classes affects the test scores (expressed as a percent) of students. The control group has 10 students and the treatment group, which listens to music between classes, has 10 students. The table shows the results. Find the experimental difference of the means, x¯¯¯_treatment−x¯¯¯_control.

	Test Scores of Students
Control Group	77%	91%	82%	85%	73%	98%	93%	81%	79%	80%
Treatment Group	80%	88%	89%	83%	70%	90%	95%	97%	86%	89%

Answer 1

The 'mean' is simply the average.

In order to find the difference in means, first we need to find the mean (average) for each group.

We have two groups, the experimental and the control.

To find the means, add up all of the test scores in each group (each row) and divide by 10 (the number of scores that are being averaged.)

Now, find the difference (subtract).

Simple as that!