A researcher wants to study the impact of learning and playing chess daily on memory skills. Sixth grade students took a memory test and then started a chess program where they played chess daily for nine months. At the end of the program, they took another memory test. The results are as follows: Memory Test Scores Before Chess Program 603.33 After Chess Program Diff (Before-After) Mean SD 74.87 726.22 90.97 -122.58 109.74 There were 12 students involved with the study. Perform a hypothesis test to determine if the researcher can claim that this is an effective method to improve memory skills. (10)