The Following Information Was Obtained from Matched Samples Taken from Two

question 23

Multiple Choice

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. $\begin{array}{lll}\text { Worker } & \text { Before } & \text { After } \\1 & 20 & 22 \\2 & 25 & 23 \\3 & 27 & 27 \\4 & 23 & 20 \\5 & 22 & 25 \\6 & 20 & 19 \\7 & 17 & 18\end{array}$
The point estimate for the difference between the means of the two populations is

• A) -1.
• B) -2.
• C) 0.
• D) 1.

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