The test meanSuppose we are interested in the population is distributed normally (Normal distribution), and we simply don't know (m) and (s2) when we want to test the hypothesis against a constant value by means of alternative Two-sided by writing a hypothesis. When is constant, m0, as we stated in the assumptions by which we do not know (s2), so we need to make a sample from a population, and then calculate the standard deviation (s) of a group of data, for example, we choose to use the T test? T0, we called a statistical test (Test Statistic), that is, we will use t-Distribution instead of Z-Distribution in reference, that is, the degree of freedom we must use equal to n-1, and the test statistic, we use Z0 instead of T0.
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