Question: On a standardized test of math achievement designed for eighth graders, the population is known to have a mean of 600 and a standard deviation

On a standardized test of math achievement designed for eighth graders, the population is known to have a mean of 600 and a standard deviation of 25. Results of a research study indicated that students receiving a special preparation course obtained a mean of 675 on the test. a) What is the effect size in this study? (3 pts.) b) Would this be considered a small, medium, large, or very large effect size? (1 pt.)

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