mathxl com MATH 1442 ELEMENTARY STATISTICS SUMMER 2017- BISH Test Exam 1 Online

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mathxl com MATH 1442 ELEMENTARY STATISTICS SUMMER 2017- BISH Test Exam 1 Online 24 of 30 (23 complete) This Question: 1 pt Which is relatively better a score of 77 on a psychology test or a score of 62 on an economics test? Scores on the psychology test have a mean of 95 and a standard d Choose the correct answer below o A. The economics test score is relatively better because itszscore is less than he z score for the psychology test score O B. The psychology test score is relatively better because its z score is less than the z score for the economics test score. O C. The psychology test score is relatively better because its z score is greater than the z score for the economics testscore. O D. The economics test score is relatively better because its z score is greater than the z score for the psychology test score. Click to select your answer

Explanation / Answer

Answer:

Which is relatively better: a score of 77 on a psych test or a score of 62 on an economics test? Scores on the psych test have a mean of 95 and a standard deviation of 6. Scores on economic test have a mean of 64 and a standard deviation of 8.

Z score for 77, z =(77-95)/6 = -3

Z score for 62, z =(62-64)/8 = -0.25

economics test score is relatively better, its z score -0.25 > -3 the psych score.

Option D

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