A sample of n = 9 scores is selected from a population with µ = 40 and σ = 18.If the sample mean corresponds to z = -1.00,then the sample mean is M = 31.

Question

Quizplus · Accepted Answer

The correct sample mean (M) is calculated using the formula for the z-score: $z = \frac{M - \mu}{\sigma / \sqrt{n}}$. Plugging in the given values ($z = -1$, $\mu = 40$, $\sigma = 18$, $n = 9$), we solve for M, which gives us $M = 34$, not 31.

A Sample of N = 9 Scores Is Selected from a Population