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group difference
compare groups of participants to each other
way to look at a trait in multiple groups in a study
grouping variable
independent variable
a categorical or discrete variable used to sort, split, or classify a dataset into distinct, non-overlapping groups
type 1 error
false positive
show that a significance is really only coincidental
independent t-test
compares the means of 2 independent groups
independent group
the groups in a study are not related in any way
independent variable
grouping variable
only 2 groups possible
analysis of variance (ANOVA)
used for testing more than two groups
only looking at 2 groups at a time
still comparing means of groups
cannot give a direction of a hypothesis
post-hoc analysis
how you find which groups are statistically significant in ANOVA test
bonferroni correction
protects the post-hoc analysis from type 1 error