In Many Eyewitness Studies,researchers Carefully Observe the "Victim's" Behaviour Under

question 188

Multiple Choice

In many eyewitness studies,researchers carefully observe the "victim's" behaviour under various conditions.The presence of a weapon appears to decrease eyewitness accuracy in identifying the perpetrator.To test whether or not this is true,researchers re-enact a robbery both with and without a gun.People viewing the robbery where a gun was used were far less accurate in their description of the robber.This knowledge has been used in courtroom cases,often discrediting eyewitness testimony.In this case,the idea that the presence of a weapon decreases eyewitness accuracy,corresponds to which of the basic goals of psychology?

• A) description
• B) understanding
• C) prediction
• D) application

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Definitions:

R Value

A statistic that represents the magnitude and direction of a correlation between two variables, often used in linear regression analysis.

Effect Size

A quantitative measure of the strength of a phenomenon or the magnitude of a relationship between variables.

Cohen

Often refers to statistical power analysis methods or effect size measures designed by Jacob Cohen, used in hypothesis testing.

Alpha

A threshold value used in hypothesis testing that determines the level of significance, often set at 0.05.