Question: Professor Yao takes a random sample from a well-defined population of interest. Which of the following is true regarding the mean (average) of a variable

Professor Yao takes a random sample from a well-defined population of interest. Which of the following is true regarding the mean (average) of a variable that Professor Yao calculates?

Select one:

a. It is a sample statistic that can be used to build the sampling frame

b. It is a population parameter

c. It is a population parameter that can be used to calculate a statistic

d. It is a sample statistic that can be used to estimate a population parameter

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