A new GRE prep class finds a sample from a recent session of their class has ave

Question

A new GRE prep class finds a sample from a recent session of their class has average scores that produce an effect size of d = -0.25 compared to the known GRE average. Interpret this effect size.

The GRE class had an average score 0.25 standard deviations below the known GRE average.

The GRE class had an average score 0.25 standard deviations above the known GRE average.

The GRE class had an average score 25 points above the known GRE average.

The GRE class had an average score 25 points below the known GRE average

The GRE class had an average score 0.25 standard deviations below the known GRE average.

The GRE class had an average score 0.25 standard deviations above the known GRE average.

The GRE class had an average score 25 points above the known GRE average.

The GRE class had an average score 25 points below the known GRE average

Explanation / Answer

The interpretation of the effect size of d=-0.25 is:

The GRE class had an average score 0.25 standard deviations below the known GRE average.

Effect size can be used while comparing two means, like fot t test, it is simply the difference in the two groups' means divided by the average of their standard deviations.

This means that if d of 1, then that the two groups' means differ by one standard deviation.

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.