Question: The researcher in the preceding problem #2 decides to conduct the same study using a within-participants design to control for differences in cognitive ability. He selects a random sample of subjects and has them study different material of equal difficulty in both the music and no-music conditions. The data appear next. As before, they are measured on an interval-ratio scale and are normally distributed; he believes that studying under quiet conditions will lead to better performance.

A- What statistical test should be used to analyze these data?

B- Identify Ho and Ha for this study?

C- Conduct the appropriate analysis.

D- Should Ho be rejected? What should the researcher conclude?

E- If significant, compute and interpret the effect size.

F- If significant, draw a graph representing the data.

G- Determine the 95% confidence interval for the population mean, based on the sample mean.

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