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# July+20th+slides - Quantitative Methods in Psychology July...

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Unformatted text preview: Quantitative Methods in Psychology July 20th, 2009: probability and sampling Jeff Vietri Corresponding to chapter 7 in the text Today’s Agenda Review Quiz Get ever closer to quantitative methods in psychology- Sampling distributions- Standard error of the mean Don’t forget the homework Quiz & review on Wed, Exam on Thurs Sampling Error The discrepancy, or amount of error, between a sample statistic and the corresponding population parameter Remember that for any population, there are many different possible samples, each of which will have a mean- In fact, you might even be able to construct a distribution of sample statistics Distribution of sample means The distribution of sample means is a collection of sample means for ALL the possible RANDOM samples of a particular size (n) that can be obtained from a population- Whenever we make a distribution of sample statistics, we call that distribution a Sampling Distribution Sampling Distribution A distribution of statistics obtained by selecting ALL the possible samples of a specific size from a population So what might we expect this to look like? Let’s look at a real example This is really only feasible with very small numbers Our Population N = 4; X = 2, 4, 6, 8 Selecting all possible combinations of samples of n = 2 All possible samples that contain 2 scores each.All possible samples that contain 2 scores each....
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July+20th+slides - Quantitative Methods in Psychology July...

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