PSY 201 Chapter Notes - Chapter 7: Null Hypothesis, Standard Score, Statistical Parameter
1 Oct 2018
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In real research practice, you often compare two or more groups of scores to each other, without any direct information about populations. Usually the only information available is from samples. Nothing is known about the populations that the samples are supposed to come from. The t test for a single sample (one-sample t test) You use the z test when the population variance is known; you use a t test when the population variance is unknown. T test - hypothesis-testing procedure in which the population variance is unknown; it compares t scores from a sample to a comparison distribution called a t distribution. T test for a single sample - hypothesis-testing procedure in which a sample mean is being compared to a known population mean and the population variance is unknown. Population 1: the kind of students who live in your dormitory. Population 2: the kind of students in general at your college.
