Experimental Psychology Week 4
Experimental Psychology Week 4 PSYC 266 - 05
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This 2 page Class Notes was uploaded by emmy_rose4267 on Friday September 16, 2016. The Class Notes belongs to PSYC 266 - 05 at Truman State University taught by Ashley Ramsey in Fall 2016. Since its upload, it has received 7 views. For similar materials see Experimental Psychology in Psychology (PSYC) at Truman State University.
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Date Created: 09/16/16
Experimental Psychology 9/12 Context variables Context variables: extraneous variables created by the research setting environment ex) name of the test could result in biased sample threatening external validity do not pick your friends or family because they could bias your sample too *talk about how to use stat chart 9/14 Central Tendency Population: set of people that all share something in common (N) Sample: subset of the population that we use to represent the population (n) Statistical inference: we make statements about a population based on a sample Continuous scale: allows for fractional amounts and so decimals make sense Discrete scale: only wholenumber amounts can be measured Dichotomous variable: yes or no, correct or incorrect Central tendency: score that summarizes the location of a distribution on a variable Mode is used when scores are nominal Median is used when variables are ordinal or if something is highly skewed Mean is used when scores are interval or ratio when distribution is symmetrical 9/16 Measures of Variability Extent to which scores are spread out in a distribution Deviation: the distance separating the score from the mean The sum of the deviations around the mean always equal zero Sample variance: the average of the squared deviations of scores around the sample mean 68% is 1 standard deviation out from the mean 95% is 2 standard deviations out from the mean 99% is 3 standard deviations from the mean ZScores ZScore: distance from raw score to the mean when measured in standard deviations Percent, zscore, and data score are the 3 things to know on a normal curve
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