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CH9: Testing the Difference Between Two Means, Two ...
www.math.ucdenver.eduCH9: Testing the Difference Between Two Means or Two Proportions Santorico - Page 360 Section 9-2: Testing the Difference Between Two Means of Independent Samples: Using the t Test Many times the conditions set forth by the z test in Section 9-1 cannot be met (e.g., the population standard deviations are not known).