Experimental designs
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Experimental designs. Between- / Within-subjects . Between-subjects design Each partcipant takes part in 1 experimental condition Analysis of differences between groups of participants from different conditions Within-subjects design Subjects take part in all conditions

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Between within subjects
Between- / Within-subjects

  • Between-subjects design

    • Each partcipant takes part in 1 experimental condition

    • Analysis of differences between groups of participants from different conditions

  • Within-subjects design

    • Subjects take part in all conditions

    • Analysis of differences of results from same participants over different conditions


Experimental research as conclusive research

Conclusive

Research

Descriptive

Causal

Experimentation

Field

Experiments

Laboratory

Experiments

Experimental research as conclusive research


Preexperimental designs
Preexperimental designs

  • One-Group After-Only

  • One-Group Before-After

  • Nonequivalent posttest-only


Validity in experimentation
Validity in experimentation

  • Internal validity

    • Is effect CAUSED by manipulation of independent variable?

    • Rival hypothesis / extraneous variables

  • External validity

    • Generalization beyond experimental situation





2 2 factorial design
22 Factorial Design




Pretest posttest nonequivalent control group design
Pretest-Posttest Nonequivalent Control Group Design







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