18. Playing three-dimensional video games can improve
cognitive function in older adults. In a recent experi-
ment (West et al., 2017), a sample of n = 15 older
adults were instructed to play Super Mario 64 and
similar 3-D games for six months. Participants'
scores on a cognitive assessment improved after the
six-month treatment, relative to their scores on the
cognitive assessment administered prior to the treat-
ment. The authors observed a mean difference score of
MD = 1.40, with a standard deviation of the difference
scores of s= 2.59.
a. Test the hypothesis that the treatment significantly
affected cognitive performance. Use a one-tailed
test with a = .05.
b. Computer² as a measurement of effect size.
c. Write a sentence demonstrating how the results of
the hypothesis test and the effect size would appear
in a research report.