单项选择题
Which of the following statements are TRUE? I. The mean of a sample of five numbers (5 + 2 + 4 + 5 + 4) is ΣX / (n -1) = 5. II. The standard error of the sample means of the numbers above is s/ (n-1) = .75. III. The variance of a sample of five numbers (5 + 2 + 4 + 5 + 4) is Σ(X - X)2 / (n-1) = 1.5. IV. The sampling error is the difference between a sample statistic and its corresponding population parameter.
A.III and IV only.
B.III only.
C.I, II, and III only.
D.I, II, III, and IV.
A.75.
B.5.
C.
A.III
D.
B.III
E.
C.I,
F.
D.I,
G.