week 10 Flashcards
What is one-way ANOVAs
test of difference 3 or more conditions: is a parametric test, compares mean scores across conditions. 2+conditions
What is a one-way within subjects ANOVA
Extension of a within subjects t-test/ paired samples t-test, same group of participants tested in three or more conditions
What is one-way between subjects ANOVA
Extension of an independent test/between subjects t-test, three or more different groups of participants
What is a Factor
the independent variable
What is a level
the separate conditions present within the factor
What are the steps to do ANOVA
1) Calculate the descriptive statistics
2) identify whether the data meet the assumptions for our chosen test
3) calculate the F value
4) identify whether the result is significant
5) reject or fail to reject the Null-hypothesis
6) write up
What is Sphericity
homogeneity of variance of the difference between conditions
What is Mauchly’s test
if significant- sphericity assumption violated
need to read differences of the SPSS output depending on whether the test is significant or not
What happens is Mauchly’s test is significant
read Greenhouse-Geisser
What happens if Mauchly’s test is not significant
read Sphericity-Assumed
How do we calculate the F value in the ANOVA
F= ms between/ ms error
What is Post-Hoc test
So, we need a way of comparing our different condition
What is the problem with doing multiple t-tests
increases probability of the type 1 error
What do you use in a post-hoc test for within subjects
Bonferroni Pairwise Comparisons as it compares pairs of conditions
What is the Friedman test
For IVs with 3 or more conditions, within-subjects design
