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The Following Information Was Obtained from Matched Samples Taken from Two

question 30

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.  Worker  Before  After 12022225233272742320522256201971718\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 null hypothesis to be tested is H0: μ\mu d = 0.The test statistic is

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