(documentationtTestEnglishLanguage "A t-Test is a way testing a hypothesis on the basis of a difference between sample means. Here (tTest ?COLL1 ?COLL2 ?PROB) means that ?PROB is the probability that ?COLL1 and ?COLL2 are samples of the same statisticalPopulation. This is meant to be used when ?COLL1 and ?COLL2 are two different statisticalPopulations.")