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Experimental Psychology Week 4 notes

by: Elizabeth Schnarr

Experimental Psychology Week 4 notes PSYC 266 - 04

Marketplace > Truman State University > Psychology > PSYC 266 - 04 > Experimental Psychology Week 4 notes
Elizabeth Schnarr
Truman State

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About this Document

These notes cover topics like controlling extraneous variables, central tendency, and variables. These are the last set of notes before the first exam and I hope these help!
Experimental Psychology
Ashley Ramsey
Class Notes
pscyh, experimental, Psychology, variables, central, tendency, extraneous
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This 2 page Class Notes was uploaded by Elizabeth Schnarr on Friday September 16, 2016. The Class Notes belongs to PSYC 266 - 04 at Truman State University taught by Ashley Ramsey in Fall 2016. Since its upload, it has received 5 views. For similar materials see Experimental Psychology in Psychology at Truman State University.


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Date Created: 09/16/16
Week 4: 9/12­9/18  Experimental Psychology  Controlling Extraneous Variables    Context Variables  ● Context variables are extraneous variables ​produced by experimental  procedures​ created by the research setting environment, like assignment of  participants to conditions  ● Selecting your friends and having differing titles might bias your sample,  threatening external validity          Experimental Psychology  Central Tendency and Variability    Central Tendency  ● Population is a set of people, animals, or objects that share at least one  characteristic in common  ● Sample is a subset of the population that we use to draw inferences about the  population  ● Statistical inference is the process by which we make statements about a parent  population based on a sample  ● A ​continuous scale allows for fractional amounts​ and so decimals make sense  ● In a ​discrete scale, only whole­number amounts​ can be measured  ● A dichotomous variable has only two possible categories or scores  ● Measure of central tendency is a score that summarizes the location of a  distribution on a variable  ● The most frequently occurring score is called the mode  ● When there’s one mode, it’s called unimodal, but when there’s two it’s called  bimodal  ● The median is the score at the 50th percentile  ● The mean (average) is the score located at the mathematical center of a  distribution  ● Range is the difference between the two most extreme scores in a distribution      Week 4: 9/12­9/18  New Statistical Notation  ● The symbol ΣX is pronounced “sum of X ”   ● A score’s deviation is the distance separating the score from the mean  ● The sample variance is the average of the squared deviations of scores around the sample mean  ● The sample standard deviation is the square root of the sample variance  ● The population variance is the true or actual variance of the population of scores      Formulas:           


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