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CH9: Testing the Difference Between Two Means, Two ...

CH9: Testing the Difference Between Two Means or Two proportions Santorico - Page 343 CH9: Testing the Difference Between Two Means, Two proportions , and Two Variances CH9: Testing the Difference Between Two Means or Two proportions Santorico - Page 344 Section 9-1 Testing the Difference Between Two Means: Using the Z Test Suppose we are interested in determining if a certain medication relieves patients headaches. We give the drug/treatment to one group and give a placebo to a control group and compare the mean incidences of patient relief from the headache Between the two groups. If the treatment group had a statistically significant improvement in headache symptoms over the control group, then we can conclude the drug works. CH9: Testing the Difference Between Two Means or Two proportions Santorico - Page 345 So our question might be, Is the mean incidence of headache relief different for the two groups? Let 1 mean headache relief from treatment group and 2 mean headache relief from control group.

CH9: 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).

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