A within-groups experiment differs from a between-groups experiment because: The IV is split into two groups, treatment and control conditions, in a within-groups design, whereas a between-groups design includes a placebo control condition. Within-groups design makes sure everyone in the sample participates in all of the treatment conditions, whereas for a between-subjects design each participant may only be assigned to one of the treatment conditions. The independent variable can be a subject variable when you have a within-subjects design, whereas for the between-subjects design the IV can only be an experimental variable (not a subject variable). The population means are always known for a within-groups design, whereas for between-subjects designs they are unknown.
A within-groups experiment differs from a between-groups experiment because:
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The IV is split into two groups, treatment and control conditions, in a within-groups design, whereas a between-groups design includes a placebo control condition. |
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Within-groups design makes sure everyone in the sample participates in all of the treatment conditions, whereas for a between-subjects design each participant may only be assigned to one of the treatment conditions. |
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The independent variable can be a subject variable when you have a within-subjects design, whereas for the between-subjects design the IV can only be an experimental variable (not a subject variable). |
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The population means are always known for a within-groups design, whereas for between-subjects designs they are unknown. |
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