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Find the test statistic in a paired t-test

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A data set includes the heights of parents of 20 males. If the difference in height for each set of parents is found by subtracting the mother's height from the father's height, the result is a list of 20 values with a mean of 4.4 inches and a standard deviation of 4.2 inches. Use a 0.01 significance level to test the claim the mean difference is greater than zero. For this problem, the value of the test statistic is?

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This soltuion shows how to find the test statistic in a paired t-test.

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