The following information was obtained from matched samples taken from two populations. Assume the population of differences is normally distributed.
Individual
Method 1
Method 2
1
7
5
2
5
9
3
6
8
4
7
7
5
5
6
?
The null hypothesis tested is H0: ?d = 0. The test statistic for the difference between the two population means is
A. 2.
B. 0.
C. -1.
D. -2.
Answer: C
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