Chapter 9: Independent-Groups Designs & Inferential Statistics Flashcards

1
Q

What is poor internal validity?

A

An experiment has poor internal validity when you cannot say with certainty that the manipulation of the IV was what caused any observed differences in the DV

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2
Q

Possible confound: maturation

A

Treatment group/groups improve only because of the passing of time

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3
Q

Possible confound: regression of the mean

A

Post-test scores are normal/average because the pre-test scores are extremely low or high

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4
Q

Possible confound: mortality or attrition

A

Losing participants

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5
Q

What is external validity?

A

(Also known as ecological validity) refers to the ability to generalize the results of the experiment beyond the specific participant and laboratory setting

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6
Q

What test statistic is used for independent groups?

A

Between-subjects t test: can be used to determine if the numerical difference between the means of two treatment conditions is statistically significant

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