6 - Standard Scores and the Normal Curve

6 - Standard Scores and the Normal Curve - Chapter 6...

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Chapter 6: Standard Scores and the Normal Curve PSY 201 2/4/08
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Understanding the normal curves is extremely important for inferential statistics While many variables can have normal distributions, normal curve itself is a mathematical abstraction You can skip section 6.1 on history of the normal curve, as well as mathematical note at the end
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Example Set of independent events (that is, the outcome of one event does not influence the outcome of the other events ) Flipping 8 coins at once Rolling 6 dice Want to see how many coins turn up heads What is the most likely outcome for any one trial?
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Most likely to obtain 4 heads Of course, possible to get other outcomes (e.g., 1 head, 6 heads, etc.) but less likely. If you do this process enough times, will get a distribution like the normal curve More trials you have, closer you will approximate normal curve
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0 1 2 3 4 5 6 7 8 No. of Coins Landing Heads Relative %
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Normal curves can have different means and
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