PSY 2106 Lecture Notes - Lecture 8: Psy, Null Hypothesis, Test Statistic
22 Mar 2017
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Solution is the t-test: t-test replaces the denominator m with sm, changes the z-test to a t-test. Z-test: known, remember: sample means; so use standard error of the mean. Two-tailed test: critical value is higher meaning the researcher has less power, more difficult to find significance. One-tailed test: has more power, meaning that it has the better ability to find an effect if one exists in research. The basic experimental situation for using the t-statistic, or the z score. Population is known before treatment. the purpose of the experiment is to determine whether or not the treatment has an effect. A sample is selected from the treated population to help answer this question. The hypothesis testing process: a review of the steps: restate the question as a research hypothesis and a null hypothesis about the. Step 1 (example: restate the research question using the null hypothesis and the research hypothesis about the 2 possible populations.
