A set of normally distributed scores has a mean equal to 75 with a standard deviation equal to 25. If a score equals 25, then zobs for this score is.
A)-1.0
B)-2.0
C)-3.0
D)cannot determine without knowing sample size

Question

Quizplus · Accepted Answer

To find the value of zobs, we use the formula z = (x - μ) / σ, where x is the score, μ is the mean, and σ is the standard deviation. Substituting the given values, we get z = (25 - 75) / 25 = -2. Therefore, the answer is B, -2.0.

A Set of Normally Distributed Scores Has a Mean Equal