SOLUTION: I don't understand how to do these, I have researched all day. Please help. Which is relatively better a score of 84 on a psychology test or a score of 47 on an economics test?

Question 757445: I don't understand how to do these, I have researched all day. Please help.
Which is relatively better a score of 84 on a psychology test or a score of 47 on an economics test? Scores on the psychology test have a mean of 91 and a standard deviation of 10. Scores on the economics test have a mean of 51 and a standard deviation of 6.
A. The psychology test score is relatively better because its z score is less than the z score for the economics test score.
B. The economics test score is relatively better because its z score is greater than the z score for the psychology test score.
C. The psychology test score is relatively better because its z score is greater 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.
Answer by John10(297) (Show Source): You can put this solution on YOUR website!
Which is relatively better a score of 84 on a psychology test or a score of 47 on an economics test? Scores on the psychology test have a mean of 91 and a standard deviation of 10. Scores on the economics test have a mean of 51 and a standard deviation of 6.
A. The psychology test score is relatively better because its z score is less than the z score for the economics test score.
B. The economics test score is relatively better because its z score is greater than the z score for the psychology test score.
C. The psychology test score is relatively better because its z score is greater 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.
-----------------------------------
For this problem, you need to find the z-score for EACH test to compare which one is better.
To find z, apply the formula z = (score - mean)/standard deviation.
I help you on the first z-score for psychology:
z = (84 - 91)/10 = -0.7
Then you can find the z-score for economy score. Then you compare them. The higher z-score means relatively better.
Good luck! John
RELATED QUESTIONS
How do I find the area of a trapezoid? I don't understand so please help (answered by ewatrrr)

Help....I am completely lost and do not know where to begin with this question...please,... (answered by stanbon)

6. Which is relatively better: a score of 76 on a psychology test or a score of 33 on an... (answered by CubeyThePenguin)

1. Which is relatively better: a score of 76 on a psychology test or a score of 33 on an... (answered by CubeyThePenguin)

Can someone let me know which formulas to use for these problems please? I have all the... (answered by Edwin McCravy)

Suppose P and Q' are subsets of U. n(U) = 15, n(P) = 6, and n(Q') = 4. Find a. n(p') b. (answered by ikleyn)

Quick question. 23-(x-7) Trying to understand how this is solved. I know the... (answered by josgarithmetic)

Please help me understand this! I have a test soon and I don`t get how to do this!!!... (answered by checkley71)