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Definition
| selecting participants entirely by chance without strategy/equal probability sample |
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Definition
| assigning to a group randomly (participants are already in study) |
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| Threats to validity can lead to... |
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Definition
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Definition
| the probability of detecting real differences between conditions |
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| the differences betweeb groups, tx's, or conditions. The MAGNITUDE of the differences between two or more conditions (expressed in standard deviation units) |
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| 9 Threats to internal validity (ASH M RATIA) |
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Definition
1. Ambiguous Temporal Precedence (chicken or the egg)
2. Selection
3. History (events occurring during study)
4. Maturation (over time)
5. Regression (to the mean)
6. Attrition(loss of respondents)
7. Testing (practice/retesting/familiarity with tests)
8. Instrumentation(measure may change over time)
9. Additive and Interact Effects of Threats to Internal Validity: combine threat effects of two or more threats |
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| What is the "reasonable doubt test"? |
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Definition
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| Threats to internal validity |
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Definition
Ambiguous Tempporal Precedence (chicken or the egg)
Selection
History
Maturation
Regression (to the mean)
Attrition
Testing
Instrumentation
Additive and Interact Effects of Threats to internal validity |
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Term
| Construct validity has to do with the __________ which is used to measure the construct. |
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Definition
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| When ________ validity goes up, __________ goes down. |
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| Which has less error variance: between group or within group? |
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Definition
| Within group (bc you are comparing each subject to themselves. |
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| Experimental designs must have ________ assignment, the IV must be ___________ and a ________ group. |
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Definition
| random assignment, iv must be manipulated and s control group |
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Term
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Definition
| Pretest-Posttest Control group design |
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Definition
| Posttest only Control group design |
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Term
1 R O X O
2 R O O
3 R X O
4 R O |
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Definition
| Solomon 4 Group (costly, great effort and large sample needed) |
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Definition
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R Xa1b1 O
R Xa1b2 O
R Xa2b1 O
R Xa2b2 O |
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Definition
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Term
| __% of the curve includes+/-1 standard deviation |
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Definition
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| __% of the curve includes+/-2 standard deviations |
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Definition
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Term
| For IQ the mean is ___, a SD is __, which means a score of 115 is _SD above the mean. |
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Definition
| 110, 15, 1 standard deviation |
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| In z-scores, the mean is _. |
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Definition
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| In T-scores the mean is __ and the standard deviation is __. |
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Definition
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Definition
normal distribution
-interval or ratio scales
tests hypothesis about population parameters |
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Definition
-Not a normal distribution
-Nominal/Categorical or Rank/Ordinal scale
these tests have LESS power that
-Parametric tests (Chi Squared is a well known example) |
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| typical outlier distance? |
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Definition
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| Magnitude of effect in correlation |
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Definition
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| Beta weights are another name for... |
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Definition
| unique contributions, semi-partials (Parts on SPSS) |
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