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.
The independent-samples t test evaluates the difference between the means of two independent. or unrelated groups. That is, we evaluate whether the means for two independent groups are. significantly different from each other. The independent-samples t test is commonly referred to. as a between-groups design, and can also be used to analyze a control and experimental group. With an independent-samples t test, each case must have scores on two variables, the grouping. (independent) variable and the test (dependent) variable.