The National Assessment of Educational Progress NAEP include

The National Assessment of Educational Progress (NAEP) includes a mathematics test for high school seniors. Scores on the test range from 0 to 300. Suppose that you give the NAEP test to an SRS of 900 12th-graders from a large population in which the scores have mean = 150 and standard deviation = 35. The mean x will vary if you take repeated samples. The sampling distribution of x is approximately Normal. It has mean = 150. What is its standard deviation?

A. 35. B. 1.167. C. 0.039.

Solution

B. 1.167.