The term is best known as a mechanical effect, and is used as an analogy to a falling row of dominoes. It typically refers to a linked sequence of events where the time between successive events is relatively small.
9 terms. What is the difference between a z test and a t-test. Z: tests probability sample was drawn from a population with a known mean and known standard deviation. T; tests probability sample was drawn from a population with known mean but unknown standard deviation. z-test.
T-test. The ttest command performs t-tests for one sample, two samples and paired observations. The single-sample t-test compares the mean of the sample to a given number (which you supply). The independent samples t-test compares the difference in the means from the two groups to a given value (usually 0).In other words, it tests whether the difference in the means is 0.he single sample t-test tests the null hypothesis that the population mean is equal to the given number specified using the option write == . For this example, we will compare the mean of the variable write. In this example, the t-statistic is 4.1403 with 199 degrees of freedom.