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.
One sample t test is used to test whether or not a a sample mean is significantly different from a hypothetical or known population mean. Think of an allegation like, âin this town, the average age at death is 50â. On the other hand, a two sample t test is used to compare two means from two different populations.