Suppose a population consisted of 20 items. How many different samples of n = 3 are possible?
A.6840
B.1140
C.20
D.120
- · 有4位网友选择 B,占比44.44%
- · 有3位网友选择 C,占比33.33%
- · 有2位网友选择 D,占比22.22%
A.6840
B.1140
C.20
D.120
A. One
B. Two
C. Three
D. Four
A、five/four
B、four/four
C、four/three
D、four/two
B.Panel Interview
C.Group Interview-Individual Interview
D.Telephone Interview
A、variances are equal.
B、population variance is smaller than the sampling distribution variance.
C、population variance is larger than the sampling distribution variance.
D、variances have the same degrees of freedom.
A、the standard deviation of the sampling distribution of sample means.
B、always normally distributed.
C、sometimes less than 0.
D、the variance squared.
A、population deviation.
B、population standard deviation.
C、standard error of the mean.
D、sampling error.
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