Students applying to graduate schools in many disciplines are required to take the Graduate Record Examination (GRE). An ambitious undergraduate student creates a study program that she believes will greatly increase students’ GRE scores, relative to the general population. She recruits a sample of 36 students believed to be representative of the larger undergraduate student population and puts them through the study program. Afterwards, they complete the GRE and receive a mean score of M = 1052. The GRE is normally distributed in the general population with a mean of μ = 1000 and a standard deviation of σ = 150. a) Using the data provided in question 1 above, calculate and interpret the effect size, Cohen’s d.  b) Given the results of the analysis and the associated effect size, do you think this study program was a very effective way to change GRE score outcomes? Why or why not?

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Students applying to graduate schools in many disciplines are required to take the Graduate Record Examination (GRE). An ambitious undergraduate student creates a study program that she believes will greatly increase students’ GRE scores, relative to the general population. She recruits a sample of 36 students believed to be representative of the larger undergraduate student population and puts them through the study program. Afterwards, they complete the GRE and receive a mean score of M = 1052. The GRE is normally distributed in the general population with a mean of μ = 1000 and a standard deviation of σ = 150.

a) Using the data provided in question 1 above, calculate and interpret the effect size, Cohen’s d. 

b) Given the results of the analysis and the associated effect size, do you think this study program was a very effective way to change GRE score outcomes? Why or why not?

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