Review session notes for Exam2

Review session notes for Exam2 - Exam Review Session...

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Exam Review Session Probability A random sample (1) Each individual has an equal chance of being selected. (2) If more than one individual is selected, the probabilities must stay constant for all selections. Example: A jar contains 10 black marbles and 30 white marbles. a. What is the probability of obtaining a black marble? b. After taking 1 black marble out, what is the probability of obtaining another black marble? c. If we take a random sample of n=3 marbles from the jar and the first two are white, what is the probability that the third would be black? Remember: a random sample requires replacement . Answer: a. 10/40 = .25 b. 9/39 = .23 c. 10/40 = .25 The normal approximation to the binomial distribution The binomial distribution will approximate a normal curve as sample size increases. pn the number of times category A occurs qn the number of times category B occurs Specifically, if both pn and qn are either equal to or greater than 10, the distribution will approximate a normal curve.

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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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Review session notes for Exam2 - Exam Review Session...

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