A Researcher Randomly Selects a Sample of Athletes and Reports

Multiple Choice

A researcher randomly selects a sample of athletes and reports that their average score on a health and fitness scale is 23.Based on the characteristics of the sample mean,what does this say about the mean in the population?

A) Nothing; it was just a sample.
B) There is no way to know without knowing the size of the sample.
C) It tells us that the mean in the population is no less than 23.
D) We expect that the population mean is equal to 23 because the sample mean is an unbiased estimator of the population mean.