cheating sheet

# cheating sheet - Parameter: Descriptive measure of a...

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Parameter: Descriptive measure of a population Ex: Average salary of the 837 baseball players, μ = 1,447,690 Sample: Set of data drawn from the population Statistic: Descriptive measure of a sample Population: Set of all items of interest in a statistical problem; size of a population can be finite or infinite. Scales of Measurement Ratio: Quantitative scale Inherently defined zero (salary, height, distance) Interval: Quantitative scale Ratios not meaningful No inherently defined zero (temperature) Ordinal: Qualitative ( categorical ) scale Meaningful order of categories (income, class) Nominative: Qualitative ( categorical ) scale No meaningful ordering (gender, ethnic class) Descriptive Statistics: Body of techniques to summarize and present the essential information in a data set. Ex: Daily high temperatures for Jan 16, 1991 in 30 U.S. cities: Measures of central tendency: Mean (m): Average or expected value Median (Md): Middle point of ordered observations Mode (Mo): Most frequent value

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## This note was uploaded on 03/31/2008 for the course BUAD 310 taught by Professor Lv during the Spring '07 term at USC.

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cheating sheet - Parameter: Descriptive measure of a...

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