Suppose a population mean is assumed to be 20 and the sample standard deviation is 5.Then,a score of 15 would have a Z-value of approximately ____.
A)-7.00
B)-1.00
C)+1.00
D)+5.00

Question

Quizplus · Accepted Answer

Z-score is calculated as (X-μ) / σ, where X=15, μ=20 and σ=5
Substituting the values, we get Z-score = (15-20) / 5 = -1
So, the Z-value for a score of 15 is approximately -1.00, which is option B.

Suppose a Population Mean Is Assumed to Be 20 and the Sample