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Unformatted text preview: Parameter: descriptive measure of a population. N represents population size (finite or infinite) Scales of Measurement Ratio variable Quantitative scale (almost all) Ratios meaningful, inherently defined zero (e.g., salary, weight, distance) Interval variable Quantitative scale (very few) Ratios not meaningful, no inherently defined zero (e.g., temperature ) Ordinal variable Qualitative (Categorical) scale Meaningful ordering or ranking of categories (e.g., class) Nominative variable Qualitative (Categorical) scale No meaningful ordering or ranking of categories (e.g., gender, color) Categorical variables: Pie Charts and Bar Graphs Quantitative Variable: Histogram To make a histogram: Divide the range of the data set into equal intervals For each interval draw a bar with the base covering the interval and the height proportional to the count of observations that fall into the interval....
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- Spring '07