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Chapter1Statistics

# Chapter1Statistics - Descriptive Statistics Variable...

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1 Descriptive Statistics Variable - something that can vary or change Dependent variable - something we measure Data - a collection of measurements Statistics - summary descriptions of data (i.e., mean, medium, range)

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2 Descriptive Statistics Used to describe or summarize sets of data to make them more understandable measures of central tendency mean, median, mode measures of variability range, standard deviation measures of association correlation coefficient
3 Measures of Central Tendency What is the average family income above? Mean - the arithmetic average Median - the center score Mode - the score that occurs the most

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4 Measures of Variability Range - the difference between the highest and lowest score in a set of data Standard deviation - reflects the average distance between every score and the mean
Correlation Coefficient Often we measure more than one variable Grade point and SAT score Are they related? Correlation statistic is a way to find out

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Chapter1Statistics - Descriptive Statistics Variable...

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