Comparing Two Means: t- Test
(Sigma Unknown)

One-Sample Case (Test Value)
              Web - Excel - Excel Tutorial
              Stats4U Tutorial - SPSS Tutorial
              Web - Excel for Manual Inputs *
Two-Sample: Independent Samples
              Web - Excel - Excel Tutorial
              Stats4U Tutorial
              Web - Excel for Manual Inputs
              SPSS Tutorials: Same and Not Same Variances
              F Distribution Tables (Also Table A6 and A7)
             
Effect Size and Pooled Statistics: Independent Samples
              Web - Excel - Excel Tutorial
              Effect Size
              Web - Excel for Manual Inputs
Two-Sample: Dependent Samples (Paired Test)
             Web - Excel - Excel Tutorial
             Stats4U Tutorial - SPSS Tutorial
             Web - Excel for Manual Inputs

* Manual Inputs programs allow analyzing means using sample
   statistics rather than from scores of samples