PSY 201 Chapter Notes - Chapter 4: Null Hypothesis, Standard Score, Statistical Hypothesis Testing
23 Sep 2018
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Hypothesis - a prediction intended to be tested in a research study. Hypothesis testing - procedure for deciding whether the outcome of a study (results for a sample) supports a particular theory or practical innovation (which is thought to apply to a population). Theory - a set of principles that attempt to explain one or more facts, relationships, or events. Step 1: restate the question as a research hypothesis and a null hypothesis about the populations. Population 1: babies who take a specially purified vitamin. Population 2: babies in general (who do not take the vitamin). Research hypothesis - a prediction about the difference between populations. Null hypothesis - a statement about a lack of difference between populations, the crucial opposite of the research hypothesis. Step 2: determine the characteristics of the comparison distribution. The overall logic of hypothesis testing involves figuring out the probability of getting a particular result if the null hypothesis is true.
