In the test to determine significance difference between two means generated by independent samples,there is no provision for testing a directional hypothesis such as "males drink more soft drinks per week than females."

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The test for significance difference between two means generated by independent samples does provide for testing a directional hypothesis. This is done through a one-tailed test, where the researcher specifies the direction of the difference (e.g. males have higher mean than females) and only looks at the corresponding tail of the distribution.

In the Test to Determine Significance Difference Between Two Means