DOC PREVIEW
UW-Milwaukee PSYCH 325 - Experience Carefully Exploited Quasi-Experimental Research Designs

This preview shows page 1 out of 3 pages.

Save
View full document
View full document
Premium Document
Do you want full access? Go Premium and unlock all 3 pages.
Access to all documents
Download any document
Ad free experience
Premium Document
Do you want full access? Go Premium and unlock all 3 pages.
Access to all documents
Download any document
Ad free experience

Unformatted text preview:

Psych 325 1st Edition Lecture 19 Current LectureChapter 8: Quasi-experimental Research Designs (Cont'd)-Finish reading ch 8 Pelham--Quasi-Experimental designs for today's lecture-Introduce ch 7--Experimental Methods on Thurs-Effect of natural disaster on stressoOGPP: history and maturation are key threats to internal validityoPONEG: problem? The two groups may be different before the disasteroPPNEG: includes all of the elements in the designs above: minimizes history maturation-However, confounds are still a problem because of:Lack of researcher controlLack of random assignment of participants to conditions-Adding patches (i.e. new control group, add pre-test)Provides more confirmation of the independent variable effectDecreases the role of confounds-Popular designs:-Natural treatment designoManipulation occurs naturally-Uncontrolled eventDisasterGovernment policy change-Post-event observationoImproves with…-Pre-event observation-Good comparison groupoInternal validity problems-Did event cause change?-Are changes due to maturation or history?oOne of the most popular QE designs (see pages 249-252)-Patches lateroNTD: the manipulation occurs naturally (uncontrolled event)-Problem: events do not occur at random-Solution: pre-event observation-Problem: internal validity-Solution: good comparison groupoPBTD: partly experimental (>=true IV; >=measured IV)These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.-"person variable interactions"-How do different people respond to your manipulation?Notice how the two depression groups can be extreme groups (std. deviation).oNGET: participant is very critical of another person who contradicts own American values (experimental manipulation) ONLY when reminded of their own mortality (i.e. standing in front of funeral home)-Mortality salience: defending self against thoughts of death-Need to pre-test differences in mortality salience to enhance internal validityoAdd patches to each design to confirm effect of IV and minimize role of confounds-Person by treatment designoPartially experimental-At least one true IV-At least one measured IVoPerson variable interactions-Examine interaction effects-How do different people respond to manipulation?oCan select extreme groups-Often study people very high and very low on measured variable-Maximizes differences-Be careful of regression to mean!oVulnerable to person confoundsoAnother popular QE design: HYBRID (see pages 243-248)-Patches lateroPBTD: partly experimental (>=true IV; >=1 measured IV)-"person interactions"-How do different people respond to your manipulation?-Notice how the two depression groups can be extreme groups (std. deviation)oAdd patches to each design to confirm effect of IV and minimize role of confounds-Natural groups with experimental treatmentoExperiment conducted with existing groups-Naturally occurring groups-Can't be changedoGroups get different treatmentoMajor person confounds: how can you argue causality?-Establish similarity on important variables to study-Measure potential confounds-Assess pre-test treatment differencesoSee pages 253-4-NTD: the manipulation occurs naturally (uncontrolled event)oProblem? Events do not occur at randomoSolution: pretest accidents and control group-PTD: say that a health psychologist wants to study cardiovascular responses to mental stressing people who have highly hostile personalities (vs. others who are very low in hostility). So she provokes anger in participants by having them talk about a past event that made them angry. Immediately after that, she has some ruminate (i.e. keep thinking about) the event for 5 minutes and has others meditate while breathing deeply for 5 minutes. She randomly assigns half of the high-hostile and half of the low-hostile participants to ruminate condition and half of the high-hostile and half of the low-hostile participants to the mediate condition. As hypothesized, she finds that among highly hostile participants, that meditation predicts lower increases in blood pressure than rumination oIVs: level of hostile personality (higher scores mean more cynical outlook)-Use extreme groups approach to dichotomize scores-Type of coping response (ruminate vs. meditate) (experimental manipulation)oDV: change in blood pressure during coping response (from baseline score)-NGET: oIVs: music preference (heavy metal vs. classical) natural groups-Type of mood induction (negative vs. positive) (experimental manipulation)oDV: sleep quality (from paper and pencil survey scale; higher scores means people sleep betteroHypotheses: people who listen to classical music will sleep better especially when they are in a good mood-Role of heavy metal in sleep quality is not influenced by type of mood induction-Patched-up designoResearcher adds (patches) conditions to quasi-design-Establishes size of effect-Rules out confoundsoAdding control conditions-Can be done after original data has been collected-Each patch can improve argument for


View Full Document

UW-Milwaukee PSYCH 325 - Experience Carefully Exploited Quasi-Experimental Research Designs

Documents in this Course
Load more
Download Experience Carefully Exploited Quasi-Experimental Research Designs
Our administrator received your request to download this document. We will send you the file to your email shortly.
Loading Unlocking...
Login

Join to view Experience Carefully Exploited Quasi-Experimental Research Designs and access 3M+ class-specific study document.

or
We will never post anything without your permission.
Don't have an account?
Sign Up

Join to view Experience Carefully Exploited Quasi-Experimental Research Designs 2 2 and access 3M+ class-specific study document.

or

By creating an account you agree to our Privacy Policy and Terms Of Use

Already a member?