PSYC 2600 Lecture Notes - Lecture 4: Descriptive Statistics, Pareto Chart, Scatter Plot
23 Jan 2019
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Document Summary
Graphs can have positive and negative uses. When the independent variable is nominal and the dependent variable is interval. Pareto chart : bar graph in which categories along the x-axis are ordered. Bar graphs can be used to highlight differences between means (averages) from highest to lowest. Scatterplot : graph that depicts the relation between two scale variables. One interval variable: histogram or frequency polygon. One interval independent & dependent variable: scatterplot or line graph. One nominal independent & one interval dependent variable: bar graph. >2 nominal independent & one interval dependent variable: bar graph. N or n : number of scores, observations. M = (x1 + x2 + x3 + xn) / n. Statistical formulas follow standard rules for the ordering of mathematical operations: operations in parentheses, squaring, multiply/divide, add/subtract. All the digits to the right of decimal are necessary for perfect accuracy. However, in practice, only the first three digits past the decimal are typically used in publications.
