A random sample of six police trainees were shown 10 different license plates projected on the screen, one at a time. Two minutes later, the police trainees were asked to write down as many of the 10 license plate numbers as possible, in any order at all. These six traineeswho took this test where then given a week-long memory training course. They were then retested in the same manner. The results are shown in the table below.

Before	6	5	8	4	4
After	8	6	8	6	6

The appropriate test for this situation is:

Select one:

a.

a one-sample t-test for means.

b.

a two-sample z-test for proportions.

c.

a matched pair t-test.

d.

a two-sample t-test for means.