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A pooled two independent samples t-test was conducted to compare the average number of accidents for male drivers to that for female drivers. The t-test statistic was 2.4 and the sample sizes were 32 males and 30 females.
-Based on Cohen's interpretation, this effect is
A) a small effect, not obvious without statistics.
B) a medium effect, obvious to careful observers.
C) a large effect, obvious to most observers.

Question

Use the following information for questions:
 A pooled two independent samples t-test was conducted to compare the average number of accidents for male drivers to that for female drivers. The t-test statistic was 2.4 and the sample sizes were 32 males and 30 females.
-Based on Cohen's interpretation, this effect is
A) a small effect, not obvious without statistics.
B) a medium effect, obvious to careful observers.
C) a large effect, obvious to most observers.

Quizplus · Accepted Answer

A t-test statistic of 2.4 typically indicates a medium effect size, which is noticeable to careful observers according to Cohen's interpretation.

Use the Following Information for Questions