UW-Madison PSYCH 225 - Final Exam Study Guide (35 pages)

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Final Exam Study Guide



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Final Exam Study Guide

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Lectures 18-23 including book readings


Pages:
35
Type:
Study Guide
School:
University of Wisconsin, Madison
Course:
Psych 225 - Experimental Psychology
Edition:
1

Unformatted text preview:

Psych 225 Exam 3 Study Guide Lectures 18 23 Book Readings Exam 3 Chapter 8 Control The Keystone of the Experimental Method scientists increase certainty by creating an artificial situation the experiment in which important factors can be controlled and manipulated control technique used to reduce the effects of extraneous variables on results and to ensure greater certainty that the changes in the DV result from the IV emphasize control as control as related to participant assignment control as related experimental design and the assurance of internal validity control as related to the logic of experimentation Control Achieved Through Participant Assignment and Selection one class wants to study how accurately people can measure time don t want to use girls vs guys because then gender can be a cofound don t want to call all friends or people that are in on a certain night could be different using all P s from one school college can affect external validity best way is to use random sampling Random Sampling most common technique is called random number tale random number tale table of numbers created so that their occurrence cannot be predicted from a mathematical formula to avoid sex confound someone suggests using only participants of one sex called an elimination procedure but would limit the generality of the finding because only pertains to one sex equating procedure use same number of men and women matching P s are matched in terms of a pre test example in book chose to use equating method equating does not eliminate sex difference but controls for any sex difference someone else says they can assign first 5 women and first 5 men to one condition and second 10 to the other but this may introduce another cofound may be some correlation between tardiness promptness and ability to tell time another wants to assign them ECECEC but this can create bias so needs to use counter balance counterbalancing procedure like simple alternation this ensures that each condition



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