Over the entire six years that students attend an Ohio elementary school, they are absent, on average, 28 days due to influenza. Assume that the standard deviation over this time period is σ = 9 days. Upon graduation from elementary school, a random sample of 36 students is taken and asked how many days of school they missed due to influenza. What is the expected value for the sampling distribution of the number of school days missed due to influenza?
A) 6
B) 9
C) 28
D) 168

Question

Quizplus · Accepted Answer

The expected value for the sampling distribution of the number of school days missed due to influenza can be found using the formula: E(X) = μ = 28. Since the question is asking for the expected value of the sampling distribution, which is the mean of all possible sample means, we use the population mean as the expected value. Therefore, the answer is 28.

Over the Entire Six Years That Students Attend an Ohio