Use the following information for questions:
Scores on an English spelling test are determined for a sample of 16 5 th graders both before and after they learn some new vocabulary "tricks of the trade". In the population of difference scores it is know that students improve with an average of 3 points, with a standard deviation of 4 points, and that the distribution of the differences is approximately normal.
-What is the expected value of the sample mean difference in spelling scores?
A) 16
B) 5
C) 3
D) 4

Question

Use the following information for questions:
 Scores on an English spelling test are determined for a sample of 16 5 th graders both before and after they learn some new vocabulary "tricks of the trade". In the population of difference scores it is know that students improve with an average of 3 points, with a standard deviation of 4 points, and that the distribution of the differences is approximately normal.
-What is the expected value of the sample mean difference in spelling scores?
A) 16
B) 5
C) 3
D) 4

Quizplus · Accepted Answer

The expected value of the sample mean difference in spelling scores is the population mean difference, which is given as 3 points.

Use the Following Information for Questions