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The student in Question 5 from Module 18
decides to conduct the same study using a
within-participants design in order to control
for differences in cognitive ability. He
selects a random sample of participants and
has them study different material of equal
difficulty in both the music and no music
conditions. The data appear below. As
before, they are measured on an intervalratio
scale and are normally distributed.
Music No Music
6 10
7 7
6 8
5 7
6 7
8 9
8 8
a. What statistical test should be used to
analyze these data?
b. Identify H0 and Ha for this study.
c. Conduct the appropriate analysis.
d. Should H0 be rejected? What should the
researcher conclude?
e. If significant, compute the effect size and
interpret.
f. If significant, draw a graph representing
the data.

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