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## Experimental Psychology Week 4

by: emmy_rose4267

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# Experimental Psychology Week 4 PSYC 266 - 05

Marketplace > Truman State University > Psychology (PSYC) > PSYC 266 - 05 > Experimental Psychology Week 4
emmy_rose4267
Truman State

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These notes cover the lectures for week 4
COURSE
Experimental Psychology
PROF.
Ashley Ramsey
TYPE
Class Notes
PAGES
2
WORDS
CONCEPTS
Psychology
KARMA
25 ?

## Popular in Psychology (PSYC)

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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