The following information was obtained from matched samples taken from two populations.The daily production rates for a sample of workers before and after a training program are shown below. Assume the population of differences is normally distributed.
Worker
Before
After
1
20
22
2
25
23
3
27
27
4
23
20
5
22
25
6
20
19
7
17
18
?
Given that the null hypothesis to be tested is H0: ?d = 0,
A. the null hypothesis should be rejected.
B. the null hypothesis should not be rejected.
C. the alternative hypothesis should be revised.
D. the null hypothesis should be revised.
Answer: B
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