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

question 33

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,then the researcher should find ____.​

• A)​a sample mean difference near zero
• B)​a t statistic near zero
• C)​the variance of the difference scores is near zero
• D)​a very large variance in the difference scores

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