A Researcher Uses a Repeated-Measures Design to Compare Individuals' Performance

question 22

Multiple Choice

A researcher uses a repeated-measures design to compare individuals' performance before treatment with their performance after treatment.If all of the participants show improved performance of 8 or 9 points after treatment,what should the researcher find?

• A)The sample mean difference is near zero.
• B)The t statistic is near zero.
• C)The variance of the difference scores is near zero.
• D)None of the other options is correct.

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