Chapt.%207-1

Essentials of Statistics for the Behavioral Science

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Unformatted text preview: Chapter 7 Probability and Samples 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? 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 DISTRIBUTION OF SAMPLE STATISICS...
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This document was uploaded on 02/18/2011.

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Chapt.%207-1 - Chapter 7 Probability and Samples...

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