Term
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Definition
N X O
N O
but because the subjects in the two groups were not randomly assigned to the groups, it cannot be concluded or assumed that they are equivalent.
This design is typically used in environmental or occupational epidemiology.
The control group would be people not exposed. |
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Term
| True experimental designs are characterized by having: |
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Definition
A control group
AND
Randomization (random assignment) of the subjects into the groups. |
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Term
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Definition
| is how the TOTAL subjects – (the sample) are selected from a population. |
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Term
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Definition
| is how subjects are placed into the groups (arms) of the experiment - the R in the shorthand notation refers to this random assignment, NOT to how the sample was chosen. |
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Term
| T/F In a true experimental design you make a random selection of subjects from the population. Then you randomly assign those subjucts into different groups (control and experimental) |
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Definition
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Term
| What does random assignment attempt to create? |
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Definition
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Term
| What does random assignment attempt to create? |
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Definition
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Term
| What does random assignment attempt to create? |
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Definition
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Term
| Probabilistic Equivalence |
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Definition
| With random assignment of subjects into large enough groups, there is a high probability that the groups are equivalent. |
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Term
| When is a two-group, post test only with random assignment used? |
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Definition
This design is used when a pre-test is inappropriate, or unavailable, or it is thought maturation may be a threat to internal validity (subjects learning from the pre-test).
A pre-test would demonstrate the equivalence (or lack of) of the two groups. |
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Term
| When is a two-group, post test only with random assignment used? |
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Definition
This design is used when a pre-test is inappropriate, or unavailable, or it is thought maturation may be a threat to internal validity (subjects learning from the pre-test).
A pre-test would demonstrate the equivalence (or lack of) of the two groups. |
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Term
| When is a two-group,with pretest,post test and random assignment used? |
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Definition
| This BASIC DESIGN is widely accepted as the “gold standard” and is the one most frequently used in clinical trials of therapies. |
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