PSYC 60 Lecture Notes - Lecture 6: Unimodality, Frequency Distribution, Scantron Corporation
Document Summary
Extreme scores: usually refers to scores that fall 2 or more standard deviations away from the mean. Extreme outliers: usually refers to scores 3 or more standard deviations away from the mean. Probability has to do with proportions in populations. Probability establishes a link between populations and samples. It allows us to predict which samples can be obtained given a certain population. Inferential statistics utilizes this information to make inferences about populations from samples. Probability of a= number of outcomes classified as a / total. Probabilities range only from 0 to 1 and they must have positive values. Examples: coin toss or deck of cards number of outcomes. Examples: probability of king = p(king) = 4/52 o o. 4/52 = 0. 0769 0. 0769 = 0. 0769 7. 69% percentages. Probabilities can be expressed as fractions, decimals, or. For a random sample, these 2 conditions must be met: o. Each individual has an equal chance of being selected.
