PSYC227_fall09_week6

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

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Unformatted text preview: A diagram of a research study. Example: hormone-injected rats A Very Short Introduction to Probability 52 cards Probability of A: 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) = ? Probability and The Normal Distribution Probability and The Normal Distribution 68% 95% 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% 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) Caution 18 The unit normal table can only be used with normal-shaped distributions. !()*)+,+-. */0 1(2*, 3+4-+)5-+(/ 67 8+/0 9*:; (< -;9 <(,,(=+/> ?()*)+,+-+94 <( * /(2*, 0+4-+)5-+(/ -;*- ;*4 )99/ -*/4<(290 +/-( @ " 4:(94A *7 !B@ C D7E&F G )7 !B@ H " D7E&F G :7 !B@ C " %F G 07 !B " 6 H @ H 6F G 97 !B " % H @ H %F G <7 !B " D7I H @ H 67IF G 19...
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This note was uploaded on 02/24/2011 for the course PSYC 227 taught by Professor Shinkareva during the Fall '09 term at South Carolina.

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

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