The economics test score is relatively better because of its z score is greater that the z score for the psychology test. The calculation for this question is simply; for psychology = (68 - 85) / 15 = -1.13 for economics = (59 - 65) / 10 = -0.6 So the answer to this question is economic is relatively better.
In order to get know which test is relative
better, you have to use the formula to get the z score of psychology test and
economics test.
Z=(raw score-sample mean)/standard deviation
Solution:
Psychology = (68 - 85) / 15 = -1.13
Economics = (59 - 65) / 10 = -0.6
Through this answer you can see that economics
is closer to 0 which is the actual mean. This can be viewed through a normal
distribution graph. The closer it is to 0, the relatively better it is because
of it is more precise.
<span>So economics is relatively better than psychology
test.</span>