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matched-subjects design and a repeated-measures design

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1. For the following studies, indicate whether or not a repeated-measures t test is the appropriate analysis. Explain your answers.
a. A teacher is evaluating the effectiveness of a new computer training program for third-grade mathematics. One of the third-grade class gets regular instruction for 90 minutes each day. A second class gets the regular instruction 4 days each week, but on the fifth day spends 90 minutes working with the computer program. At the end of the school year, the teacher compares test scores for two classes.
b. A researcher is examining how light intensity influences color perception. A sample of 50 college students is obtained and each student is asked to judge the differences between color patches under conditions of bright light and dim light.
c. A research study compares problem-solving ability for participants with two different levels of self-esteem-high self-esteem and low self-esteem.

2. What is the primary advantage of a repeated-measures design over an independent-measures design?

3. Explain the difference between a matched-subjects design and a repeated-measures design

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