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The sample mean of the 28 differences is 13.18 and the sample standard deviation of the differences is 8.92. Calculate by hand the test statistic,

The sample mean of the 28 differences is 13.18 and the sample standard deviation of the differences is 8.92. Calculate by hand the test statistic, z, and state the conclusions that can be drawn from the test. Show your workings and interpret the results

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