13)A population consists of 3 numbers: 2, 10 and 6. You randomly select a sample of 2 observations without replacement and calculate the sample mean....

13)A population consists of 3 numbers: 2, 10 and 6. You randomly select a sample of 2 observations without replacement and calculate the sample mean. The expected value of the sample mean is _____.

A)4

B)9

C)3

D)6

12)Which of the following is true for a point estimate?

A)A sample statistic is a point estimate of a population parameter.

B)A point estimate is never equal to a population parameter.

C)A point estimate has less sampling error than a population parameter.

D)The probability distribution of a point estimate is the population distribution.