psych 5-ucsb-fall 2011-lecture-chapter6

psych 5-ucsb-fall 2011-lecture-chapter6 - Review...

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Unformatted text preview: Review Probability basics Probably and the normal distribution 1.What is sampling error? How do you prevent it? 2.What are the two branches of statistics? 3.What is a percentile? 4.What are the different measures of variability? 5.What does the standard deviation represent conceptually? Condition 1: No Instruction Condition 2: Instruction = 120 s = 10 s 30 s Given these population parameters, how likely is it to get a detection time of 30s? For any situation with multiple outcomes, the probability for any outcome can be expressed as a proportion or fraction of the total number of outcomes. e.g., What is the probability of a Z in the English alphabet. Probability of Z = N of outcomes that are Z N of possible outcomes Probability of Z = 1 26 Fair Coin n outcomes = 2 (heads, tails) Fair Dice n outcomes = 6 (1-6) Fair Deck of Cards n outcomes = 52 Probability of 6 = 1 6 Probability of Ace = 4 52 What is the probability of getting heads when tossing a fair coin? p ( heads ) = 1 2 = 0.5 = 50% Fraction Proportion Percentage Convention: probability=proportion, but all 3 OK Accurate estimates of probability based on our de f nition require random sampling Random sampling is a process that involves selecting from a pool of outcomes Random sampling has two fundamental requirements 1.Each individual in the population must have an equal probability of 1....
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This note was uploaded on 01/13/2012 for the course PSYCH 5 taught by Professor Collins during the Fall '08 term at UCSB.

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psych 5-ucsb-fall 2011-lecture-chapter6 - Review...

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