Provides answers to commonly asked questions about COBRA. Health Benefits Under the Consolidated Omnibus Budget Reconciliation Act (COBRA) (PDF) Provides a detailed overview of the major provisions of COBRA.
In the two-sample pooled t-test the pooled variance is computed by averaging the two individual sample variances. The assumptions for the two-sample pooled t-test for the difference in two means are that there are random samples from two independent normal populations with common but unknown variance.
Unmatched (independent) Two-sample t Test. Two assumptions are used: two independent simple random samples from two distinct populations (matching would negate independence); and both populations are normally distributed with unknown means and standard deviations.