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PSYC227_fall09_week6

# PSYC227_fall09_week6 - A diagram of a research study...

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A diagram of a research study.

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Example: hormone-injected rats
A Very Short Introduction to Probability

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52 cards
Probability of A:

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1 st draw: 2 d draw: 1 st draw: 1 st draw: Random sampling : 1.each individual had an equal chance of being selected 2.constant probability of being selected Solution: sampling with replacement
Probability and Frequency Distribution N=10, X: 1, 1, 2, 3, 3, 4, 4, 4, 5, 6 Random sample : n = 1 P(X > 4) = ? P(X < 3) = ?

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Probability and The Normal Distribution
Probability and The Normal Distribution

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68% 95%

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Adult heights – normal-shaped distribution P(X > 80)=? Probability of randomly selecting an individual who is taller than 6 feet 8 inches? Illustration
Adult heights – normal-shaped distribution P(X > 80)=? Probability of randomly selecting an individual who is taller than 6 feet 8 inches? Illustration 2.28% P(X > 80) = P( z > +2) = 2.28%

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a portion of the Unit normal table (mean 0, variance 1)
Example Proportion of normal distribution corresponding to z-score values greater than 1? P(Z > 1) = Probability of selecting z-score less than 1.5? P(Z < 1.5) = Proportion of scores below z = -0.5? P(Z < -0.5) = (a) (b) (c)

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Caution 18 The unit normal table can only be used with normal-shaped distributions.
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