Psyc Stats 9&10
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Dependent ttest
a test using the tstatistic that establishes whether two means collected from the same sample (or related observations) differ significantly

Grand mean
the mean of an entire set of observations

Independent ttest
a test using the tstatistic that established whether two means collected from independent samples differ significantly

Analysis of variance (ANOVA)
a statistical procedure that uses the Fratio to test the overall fit of a linear model

Bonferroni correction
a correction applied to the
level of control the overall Type I error rate when multiple significance tests are carried out

Experimentwise error rate
the probability of making a Type I error in an experiment involving one or more statistical comparisons when the null hypothesis is true in each case

Familywise error rate
the probability of making a Type I error in any family of tests when the null hypothesis is true in each case

Grand variance
the variance within an entire set of observations

Independent ANOVA
analysis of variance conducted on any design in which all independent variables or predictors have been manipulated using different participants

Orthogonal
means perpendicular to something

Pairwise comparisons
comparisons of pairs of means

Planned contrast
a set of comparisons between group means that are constructed before any data are collected

Post hoc tests
a set of comparisons between group means that were not thought of before data were collected

Weights
a number by which something is multiplied