Term
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Definition
-Manipulate IV
-Random sampling
-control extraneous variables |
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Term
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Definition
Environmental
Instructional
Invasive (drug/placebo) |
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Term
| Threats to internal validity |
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Definition
Biased assignment
attrition - loss or participants
pretest sensitization
history
maturation
design confounds |
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Term
| Sources of Error Variance |
|
Definition
Individual differences
transient states (Mood, physical conditions)
Environmental
Differential treatment
Measurement error |
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Term
| Minimizing error variance |
|
Definition
use homogeneous sample
aside from IV, treat participant same
hold lab conditions constant
standardize all procedures
use reliable measurement procedures |
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Term
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Definition
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