Exhibit 10-2
the Following Information Was Obtained from Matched Samples

Multiple Choice

Exhibit 10-2
The following information was obtained from matched samples.
The daily production rates for a sample of workers before and after a training program are shown below.
$$\begin{array} { c c c } \text { Worker } & \text { Before } & \text { After } \\1 & 20 & 22 \\2 & 25 & 23 \\3 & 27 & 27 \\4 & 23 & 20 \\5 & 22 & 25 \\6 & 20 & 19 \\7 & 17 & 18\end{array}$$
-Refer to Exhibit 10-2. The null hypothesis to be tested is H0: ?d = 0. The test statistic is

A) -1.96
B) 1.96
C) 0
D) 1.645