A group of graduate students studying psychology take a national comprehensive exam. On the test, their mean score is about 0.5 standard deviation above the mean as compared to the national score. The variability of their scores is less than the national mean. If passing is 1 standard deviation below the mean, it is likely that many have failed.

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Given that the group's mean score is 0.5 standard deviations above the national mean, and passing is defined as 1 standard deviation below the national mean, it is likely that most, if not all, of the students in this group have passed, especially considering their lower variability in scores.

A Group of Graduate Students Studying Psychology Take a National