Z-TEST, A statistical test used when the population standard deviation is known., NULL HYPOTHESIS, The assumption that there is no effect, no difference, or no change, T-TEST, A statistical test used when the population standard deviation is unknown and the sample size is small., TEST STATISTICS, A quantity calculated from sample data used to decide whether to reject the null hypothesis., REJECTION REGION, The interval of values for which the null hypothesis is rejected, ALTERNATIVE HYPOTHESIS, A hypothesis that represents a claim of difference or effect, HYPOTHESIS TESTING, A test that can be left-tailed, right-tailed, or two-tailed, CRITICAL VALUE, The value compared against the test statistic to make a decision, RIGHT-TAILED, The test statistic is located to the right of the critical value. “>”, TWO-TAILED, The test statistic is located to the left of the negative critical value or to the right of the positive critical value..

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