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
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
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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## This note was uploaded on 04/17/2008 for the course PSY 201 taught by Professor Arthur during the Spring '08 term at Purdue.

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

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