PSY 113 Lecture Notes - Lecture 3: Statistical Inference, Null Hypothesis, Descriptive Statistics
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Inferential statistics (to make inferences about whether our hypothesis was supported) Many frequency distributions take the form of a normal or bell-shaped curve. Three measures of central tendency: mean, median, mode. Measures of variability: the range, the standard deviation ( is the average deviation from the mean ) If the mean reaction time for the experimental group is similar to the mean reaction. We must accept the null hypothesis because our results could be due to chance. However, when we can show that two means are very different, we can say that they are significantly different . And, we can reject the null hypothesis. If results occur fewer than 5 times out of a 100, null hypothesis can be rejected. Thus, we use the 0. 05 significance level.
