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Chapt.%207-1

# Essentials of Statistics for the Behavioral Science

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Chapter 7 Probability and Samples

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Inferential Statistics Inferential statistics are procedures that allow us to reach  conclusions about populations based on sample data. Probability is the mechanism that makes this possible.  General Procedure      Collect data from a sample (obtain an empirical distribution).      Compare data to a theoretical likelihood (a theoretical  distribution)
Inferential Statistics We want to know about the likelihood of a sample result (did it  happen by CHANCE).      We expect the sample result to be a little different from the  population because of simple, random, chance variability.       Is the sample result different enough to say that it is not likely to  be the result of a random sample from our population?

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Distribution of Sample Statistics To compare samples to a population - we need a probability  distribution that deals with sample results.       The new distribution is called a SAMPLING DISTRIBUTION or a
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Chapt.%207-1 - Chapter7 GeneralProcedure (obtainanempiric

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