1.Probability sampling: ____: nonprobability sampling: ____.
| simple random sampling, purposive sampling |
| stratified random sampling, cluster sampling |
| purposive sampling, haphazard sampling |
| purposive sampling, stratified random sampling |
2. If X = experimental treatment and O = pretest or posttest observation, then for “O X O”, O represents the ____ design.
| nonequivalent control group |
| interrupted time series |
| delayed control group |
| repeated treatment |
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