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Lecture notes 5

by: Alyssa Reyes

Lecture notes 5 PSYC 2301

Alyssa Reyes
Intro to Methods in Psychology

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About this Document

Only Tuesday materials covered (since there was no class on Thursday)
Intro to Methods in Psychology
Class Notes
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This 2 page Class Notes was uploaded by Alyssa Reyes on Thursday February 12, 2015. The Class Notes belongs to PSYC 2301 at University of Houston taught by Breitmeyer in Spring2015. Since its upload, it has received 68 views.

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Date Created: 02/12/15
1 THEREFORE IT IS POSSIBLE THAT a Measures can be accurate without being reliable There can be a large random error and a small constant error Example You are driving at 60 mhr your speedometer uctuates randomly between 45 and 75 mhr Yet the average of all the observed uctuating readings indicate the true speed of 60 mhr b Measures can be reliable without being accurate There can be a large constant error and a small random error Example You are driving at a constant speed of 58 mhr but your speedometer indicates a non uctuating speed of 67 mhr The constant error is 9 miles per hour the random error is 0 or close to it c What characterizes measures that are accurate and reliable Inaccurate and unreliable c What characterizes measures that are accurate and reliable Inaccurate and unreliable 2 VALIDITY OF MEASURES a Face validity on the face of it conceptual and operational de nitions of variable are nearly identical l Easiest validity to determine i Ex driving tests exam 1 in research methods etc b Criterion validitv one measure the criterion measure is related to another measure the predictor measure of the same trait ability etc l when a question is dealing with prediction you are dealing with criterion validity Example the trait is scholastic achievement SAT predictor College GPA criterion another trait is quotdriving abilityquot written driving test predictor live driving performance criterion If you do well on the written part but fail the driving test then the written part is not a good criterion c Construct validity a measurement instrument and procedure actually assess a theoretical construct D what you can39t precisely measure i Examples of theoretical constructs Intelligence IntroversionExtroversion etc ii The more intelligent you are the more money you earn or the more physically healthy you are etc d Reactivitv of measures i Present whenever the measurement procedure changes the behavior to be measured is a threat to validity ii Lie detector it can make a person anxious Or when a person sits in a room and there is another person behind a twoway mirror watching them if the sitting person is aware they will change their behavior UP TO HERE EXAM MATERIALS


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