PSY 201 Lecture Notes - Lecture 1: Interquartile Range, Linear Map, Statistical Parameter
21 Nov 2016
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Document Summary
Descriptive statistics: psychologists use descriptive statistics to summarize and describe a group of numbers from a research study. Inferential statistics: psychologists use inferential statistics to draw conclusions and to make inferences that are based on the numbers from a research study but that go beyond the numbers. Level of stress can have values from 1-10. Examples of variables: height, social class, score on a creativity test, type of psychotherapy received by patients, speed on a reaction time test, number of people absent from work, etc. Equal-interval variable: variable in which the numbers stand for approximately equal amounts of what is being measured. Ratio scale: an equal-interval variable is measured on a ratio scale if it has an absolute zero point, meaning that the value of zero on the variable indicates a complete absence of the variable. Rank-order variable: numeric variable in which the values are ranks, such as class standing or place finished in a race.
