Can someone please help me with Stats, I would like to know why this answer is the right one?
*Which is relative better a score of 68 on a psychology test or a score of 47 on an economics test? scores on the psychology test have a mean of 86 and a standard deviation of 6. scores on the economics test have a mean of 64 and a standard deviation of 8.

I choose: The Economic test score is relatively better because its Z score is greater than the Z score for the psychology test score.

Please help!!
Thanks!

Question

Can someone please help me with Stats, I would like to know why this answer is the right one?
*Which is relative better a score of 68 on a psychology test or a score of 47 on an economics test? scores on the psychology test have a mean of 86 and a standard deviation of 6. scores on the economics test have a mean of 64 and a standard deviation of 8.

I choose: The Economic test score is relatively better because its Z score is greater than the Z score for the psychology test score.

Please help!!
Thanks!

anonymous · Answer

@jim_thompson5910, Hi!! I know this is a silly question, but do i have to solve it first? Please help me!

jim_thompson5910 · Answer

Z score for psych test

z = (x - mu)/sigma

z = (68 - 86)/6

z = -3

------------------------

Z score for econ test

z = (x - mu)/sigma

z = (47 - 64)/8

z = -2.125


So you are correct, the econ z score is larger, which means it's relatively better.

anonymous · Answer

OOh nice, Thank you!!! You are my life saver!!...jijij!!

jim_thompson5910 · Answer

yw