t-test

Statistics is a mathematical science pertaining to the collection, analysis, interpretation or explanation, and presentation of data. It is applicable to a wide variety of academic disciplines, from the physical and social sciences to the humanities. Statistics are also used for making informed decisions.
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A t test is any statistical hypothesis test in which the test statistic has a Student's t distribution if the null hypothesis is true.
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Assesses whether the means of two groups are statistically different from each other. Use this analysis if you want to compare the means of two groups.

Type VI sums of squares . We propose the term Type VI sums of squares to denote the approach that is often used in programs that only implement the sigma restricted model (as opposed to programs like STATISTICA's VGLM which offers the user a choice between the sigma restricted and overparameterized ). This approach is identical to what is described as the effective hypothesis method in Hocking (1996).
For additional details, see the Six types of sums of squares topic in the General Linear Models chapter.