PSYC 1000 Chapter Notes - Chapter 9: Confidence Interval, Null Hypothesis, Test Statistic
8 Dec 2013
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The single-sample t test and the paired-samples t test. There are three types of t tests: single-sample t test. Used when we are comparing a sample mean to a population but do not know the populations standard deviation: paired-sample t test. Used when we are comparing two samples and every participant is in both samples: independent-samples t test. When we are comparing two samples and every participant is in only one sample. We use a t distribution instead of a z distribution when sampling requires us to estimate the population standard deviation from the sample standard deviation or when we compare two samples to another. The formula for standard deviation when estimating from a sample: look at page 205. The formula for standard error when were estimating from a sample: sm= s/(square root) n. Using standard error to calculate the t statistic.
