Asked by tryingtosecurethebag
Question: Between test 1 (score of 230 and mean of 210 and standard deviation of 22) and test 2 (score of 80 and mean of 70 and standard deviation of 8), which one is better? Explain your reasoning.
I know that test 2 is better. I am not good at giving the reasoning but I think that it is due to how closer the score is to the mean.
I know that test 2 is better. I am not good at giving the reasoning but I think that it is due to how closer the score is to the mean.
Answers
Answered by
oobleck
what do you mean by "better"? Closer to the mean?
Farther above the mean -- more std away?
In any case, check the number of std from the mean; that's probably the first step.
Farther above the mean -- more std away?
In any case, check the number of std from the mean; that's probably the first step.
Answered by
tryingtosecurethebag
Nevermind it is test 2.
Test 1= z220=220-200/21=20/21=0.95=.33
Test 2= z90=90-80/8=10/8=1.25=.40
Test 1= z220=220-200/21=20/21=0.95=.33
Test 2= z90=90-80/8=10/8=1.25=.40
Answered by
Reiny
your : Test 1= z220=220-200/21=20/21=0.95=.33
doesn't even match the data given in the question.
prob(x < 230)
z-score = (230 - 210)/22 = .9091
your ... = 0.95 = .33 makes no sense
doesn't even match the data given in the question.
prob(x < 230)
z-score = (230 - 210)/22 = .9091
your ... = 0.95 = .33 makes no sense
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