Tests Comparing Two Parameters

In order to test a new drug, physicians often conduct tests involving two groups of individuals, one being a new drug and the other a placebo.  After a period of time the subjects are tested to find whether the medication had a significant impact on the experimental group's health relative to the control group.  Hypothesis tests of these nature, involving two samples in relation to each other, require procedures slightly different than the one that we've become accustomed to.

Comparing Two Variances

Comparing Two Means

Review of 2 Parameter Testing