An engineer measures the tensile strength of 50 bolts from Machine A and 50 from Machine B. They use the with Welch's correction (because the variances are different). The P value is 0.78, meaning they cannot reject the null hypothesis; both machines produce bolts of equal strength.
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If you switch from a two-tailed to a one-tailed test, watch the P value change. For directional hypotheses, the one-tailed test has more power to detect an effect in one direction, but it is controversial in many fields. GraphPad wisely defaults to the two-tailed test. An engineer measures the tensile strength of 50
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