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The Two-Group Randomized Experiment

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The Two-Group Randomized Experiment

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    1. 5:57 AM The Two-Group Randomized Experiment

    2. 5:57 AM The Basic Design R X O R O note that a pretest is not necessary in this design -- Why? because random assignment assures that we have probabilistic equivalence between groups

    3. 5:57 AM The Basic Design R X O R O

    4. 5:57 AM The Basic Design R X O R O differences between groups on posttest indicate a treatment effect usually test this with a t-test or one-way ANOVA

    5. 5:57 AM Internal Validity R X O R O

    6. 5:57 AM Experimental Design Variations the posttest-only two group design is the simplest -- there are many variations to better understand what the variations try to achieve we can use the signal-to-noise metaphor

    7. 5:57 AM Signal to Noise

    8. 5:57 AM Signal to Noise

    9. 5:57 AM Signal to Noise

    10. 5:57 AM Signal to Noise

    11. 5:57 AM Signal to Noise

    12. 5:57 AM Signal to Noise

    13. 5:57 AM Signal to Noise

    14. 5:57 AM Signal to Noise

    15. 5:57 AM Signal to Noise

    16. 5:57 AM Signal to Noise factorial designs covariance designs blocking designs

    17. 5:57 AM

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