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Cards In This Set
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Have 1 independent variable with 3 or more levels (basically just an extension of 2 group designs)
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Multiple group designs
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2 conditions when choosing a multi-group design
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1. will the addition of an extra group potentially provide meaningful, interesting, information? 2. Is it feasible to add additional group?
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Each additional group ___ the number of participants we will need
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Increases
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What is the difference between 2 group designs and multi group designs?
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Do not always have to compare 2 or more experimental groups to a control, you could compare different amounts of IV and could have "apple, oranges, pears" comparisons
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Multi-group designs can be
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Experimental or ex post facto
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When would you need to use an ANOVA
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- your independent variable (IV) is continuous - you have 3 or more groups
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A hypothesis-testing technique used to compare means from three or more populations
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One way analysis of variance (ANOVA)
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What will always be the null hypotheses
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All population means are equal
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What will always be the alternative
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At least one of the means is different from the others
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What is ANOVA
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- variability due to IV - variability due to error
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What does some variability due to error include.
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- individual differences - measurement of error - extraneous variables
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In this case what does error mean.
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Refers to any variability NOT due to IV
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In F = between- groups variability / witin groups variability. What does "between- groups variability" stand for?
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- variability due to IV & variability due to error
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In F = between- groups variability / witin groups variability. What does "within groups variability" stand for?
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Variability due to error
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Error between and within groups should be ___ assuming the study isn't compounded
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Similar
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