stats2 - 031:010 Research Methods in Psychology Spring 2010...

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031:010 - Research Methods in Psychology Spring, 2010 Feb 4 th
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sampling loop population sample summary of the sample descriptive statistics inferential statistics
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Outline Point Estimation best guess + by how much could it be wrong Comparing Two Means Type I and Type II errors Statistical Conclusion Validity
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Point Estimation best guess is almost always the same as the value for the sample best guess for population mean = sample mean best guess for correlation in the population = correlation in the sample by how much this guess could be wrong depends on how much variability is in the sample and how large a sample was taken
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Point Estimation standard error (of the mean) start with standard deviation … s then divide by square-root of N se = s / √ N now decide how often you’ll accept being wrong this is called α … in psych, we use .05 (i.e., 5 %) look up t for α and degrees of freedom (N- 1 ) multiply se by t … this is by how much you could be wrong
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Comparing Two Means
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