MCOM 3380 Exam 3 Study Guide

MCOM 3380 Exam 3 Study Guide - Exam 3 Study Guide: Chapters...

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Exam 3 Study Guide: Chapters 9, 10, 11 Chapter 9 Purpose/advantages of experiments – pg 239 o To establish causation Experiments help establish cause and effect Desire internal validity Willing to sacrifice external validity o Control Researchers have control over the environment, the variables, and the subjects o Low cost o Replication Ensures that the original results were not unique in some way Steps in conducting an experiment – pg 241 o (1) Select the setting o (2) Select the experimental design o (3) Operationalize the variables o (4) Decide how to manipulate the independent variable There are two types of manipulations Straightforward o Written materials, verbal instructions, or other stimuli presented to the subjects o Shopping list and source of television news examples on page 241. Staged o Researchers construct evens and circumstances that inable them to manipulate the independent variable.
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o Frequently involves the use of a confederate, a person who pretends to be a subject but is actually part of the manipulation. o A strong manipulation maximizes the chances that the independent variable has an effect. o (5) Select and assign subjects to experimental conditions Experimental subjects should be selected randomly o (6) Conduct a pilot study o (7) Administer the experiment o (8) Analyze and interpret the results Criteria for causation o Cause and effect must be correlated o Cause must precede the effect o Must account for alternative explanations True experiments help us with the second two criteria Random assignment – pg 244 o Randomization: randomly assigning subjects to various treatment groups o Each subject has en equal chance of being assigned to each treatment True experimental design Pre-experimental designs o One-Shot Case Study o One-Group pre-test post-test o Static group design (non-equivalent groups) Quasi-experimental designs – pg 252 o When random selection and random assignment of subjects are not possible o Two types of quasi-experimental designs Non-equivalent control group design
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Pre- and posttest differences are compared to determine whether the experimental condition had an effect Time series design A series of periodic measurements is made of a group The series of measurements is interrupted by the experimental
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This note was uploaded on 11/18/2011 for the course MCOM 3380 taught by Professor Myiahhutchens during the Fall '11 term at Texas Tech.

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MCOM 3380 Exam 3 Study Guide - Exam 3 Study Guide: Chapters...

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