The distribution of certain test scores is a nonstandard normal distribution with a mean of 50 and a standard deviation of 6. What are the values of the mean and standard deviation after all test scores have been standardized by converting them to z-scores using zx=−()μ /σ?
A) The mean is 100 and the standard deviation is 10.
B) The mean is 0 and the standard deviation is 1.
C) The mean is 10 and the standard deviation is 100.
D) The mean is 1 and the standard deviation is 0.

Question

Quizplus · Accepted Answer

When scores are standardized to z-scores, the mean becomes 0 and the standard deviation becomes 1, regardless of the original distribution's parameters.

The Distribution of Certain Test Scores Is a Nonstandard Normal