Which is relatively better: a score of 79 on a psychology test or a score of 53

Question

Which is relatively better: a score of 79 on a psychology test or a score of 53 on an economics test? Scores on the psychology test have a mean of 93 and a standard deviation of 12. Scores on the economics test have a mean of 54 and a standard deviation of 3.

Choose the correct answer below.

A. The economics test score is relatively better because its z score is greater than the z score for the psychology test score.

B. The psychology test score is relatively better because its z score is greater than the z score for the economics test score.

C. The psychology test score is relatively better because its z score is less than the z score for the economics test score.

D. The economics test score is relatively better because its z score is less than the z score for the psychology test score.

Explanation / Answer

Z = (X - mean) / sd

Z score of psychology test = (79 - 93) / 12 = -1.17

Z score of economics test = (53 - 54) / 3 = -0.33

Option-A. The economics test score is relatively better because its z score is greater than the z score for the psychology test score.

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