A recent study with 3,000 participants reported a fairly powerful negative correlation between the number of class absences by college students and their GPAs. According to recent guidelines for interpreting the magnitude of effect sizes, what r value was most likely to have been reported in this study?−.50−.30.50.30
Question
A recent study with 3,000 participants reported a fairly powerful negative correlation between the number of class absences by college students and their GPAs. According to recent guidelines for interpreting the magnitude of effect sizes, what r value was most likely to have been reported in this study?−.50−.30.50.30
Solution
Based on the information provided, we know that there is a negative correlation between the number of class absences and college students' GPAs. The study reported a fairly powerful negative correlation. To determine the most likely r value reported in this study, we can refer to the guidelines for interpreting effect sizes.
According to recent guidelines, a correlation of -0.50 is considered a large effect size, while a correlation of -0.30 is considered a medium effect size. Since the study reported a fairly powerful negative correlation, it is reasonable to assume that the r value reported in this study is most likely to be closer to -0.50 rather than -0.30.
Therefore, the most likely r value reported in this study is -0.50.
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