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
?
The point estimate for the difference between the means of the two populations is
A. -1.
B. -2.
C. 0.
D. 1.
Answer: C
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