When testing the difference for the population of paired differences in which two different observations are taken on the same units,the correct test statistic to use is ____. A)Z B)t C)F D)t²

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When testing the difference for the population of paired differences, we compare the mean of the differences to a hypothesized value. Since the population variance of the differences is typically unknown, we use the t-test instead of the z-test. The t-test is used for small sample size and tests the null hypothesis that the mean difference is zero.

When Testing the Difference for the Population of Paired Differences