A sample of typical undergraduate students is very likely to have a range of GPAs from 0.0 to 4.0, whereas graduate students are often required to have good grades (e.g., from 3.0 to 4.0). Please explain what influence these two different ranges of GPA would have on any correlations calculated on these two separate groups of students.
What will be an ideal response?
ANS:Correlations reflect the amount of variability that is shared between two variables and what they have in common. The graduate students’ GPAs do not vary nearly as much as the undergraduate students (the data are more restricted), so correlations using the graduate students’ GPAs are more likely to be close to zero than correlations using the undergraduates’ GPAs.
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