# Shared Flashcard Set

## Details

Reliability and Validity
Research methods
15
Psychology
10/19/2009

Term
 Define Reliability
Definition
 Refers to consistency or stability of the measureMust work exact same way each time it is used to be reliable
Term
 Define Method Error
Definition
 Error from the experimenter and testing situation or design
Term
 What are errors in measurment?
Definition
 Method and Trait Errors
Term
 Define Trait Error
Definition
 Error from the subjectexamples...Giving wrong information (faking good or bad), forgetting events
Term
 What is an observed score?
Definition
 Observed score = true score + measurement error
Term
 What is the formula for Reliability?
Definition
 True Score__________True score + error scoreNo error...Reliability = 1 or -1
Term
 What is a correlation coefficient?
Definition
 Value that indicates the strength of the relationships between two variablesex) hours watching tv correlates with hours playing video gamesr score range from -1.00 to + 1.00further from 0 = stronger correlationcloser to 0 = weaker correlation
Term
 Define test/retest reliability What are problems associated with test/retest
Definition
 Test people twice to see if their scores are stablereliable test scores should be the same each time they are measurePractice effects - people get better at answering the questions the second time around, so the correlation gets weakendedshort interval - if the time between completing the measure is short, people might remember how they responded to the questions(tests their memory, not reliability of the measure
Term
 Define alternate forms reliability
Definition
 two different alternative froms testsTests are equivalent
Term
 Split-Half reliability
Definition
 Split items on a measure in half and correlate the two halvestotal 50 itemsrandomly split the scale in half (25 & 25) Internal reliability not reliability over time
Term
 Interrater Reliability
Definition
 To test for reliability of observation methods you can look at the correlation between observational scores made by one person with another person   number of agreements                                              x100 number of possible agreements
Term
 Validity
Definition
 Degree to which a measure assesses what it is supposed to assess
Term
 Content Validity
Definition
 The measure contains a good sample of items that are representative of the construct   consulting with experts and thorough review of the literature to make sure construct is represented well by the items   example) depression -- need to make sure you don't just ask about behaviors but questions about thoughts and feelings about depression too
Term
 Criterion Validity
Definition
 The Psychological measure is capable of prediciting actual behavior
Term
 Construct Validity
Definition
 Refers to the degree in which the measure assesses the psychological construct (how well)   For example the measure on depression should have a strong correlation with the Beck Depression Inventory, and a weak correlation with a measure of anxiety
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