notes.9.5

# notes.9.5 - 9/5 Correlation and Causation o Correlation...

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9/5 - Correlation and Causation o Correlation does not mean caused effect, just that they are related - Illusory Correlation o An apparent relationship based on casual observations of unrelated or weakly related events - Participants for your study o Population All the people you want to make conclusions about o Sample A subset of the population for your study - Descriptive Statistics o Measurements of the Central Tendency o Measurements of Variation or Dispersion - Central Tendency o Mean Sum of all the scores divided by the total number of scores It is the numerical average Sensitive to outliers (really low or high scores) o Median Middle score when we arrange all the scores in order form lowest to highest Good to use when data is not normally distributed Median is good when there are a lot of highs or lows - Variation or Dispersion o Variance The average of the squared differences between the mean and each score [sum of(score-mean)^2] / then divide by number of

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## This note was uploaded on 09/23/2008 for the course PSY 11 taught by Professor Roberts during the Fall '07 term at Duke.

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notes.9.5 - 9/5 Correlation and Causation o Correlation...

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