Single-Factor Between-Subjects ANOVA Week 9 Flashcards
How many groups does ANOVA measure?
Three or more
What research question does ANOVA test?
Is there a significant difference between means?
Describe an independent groups design
Each participant is one level of the IV, only participating in one condition e.g either control or drug
What is the purpose of post-hoc tests?
To see WHERE the differences lie
List the designs where ANOVA can be used
- independent
- repeated measures
- mixtures of independent and repeated measures
What is the ANOVA statistic?
The F-statistic
What is F under the null hypothesis?
1
What is the underlying logic of the F-statistic?
individual differences and experimental error
What would be an alternative hypothesis for ANOVA?
At least one of the means is different from the rest
If ANOVA is less than .05, …….
There is a significant difference between the means
When would you use a post hoc test?
After you have found a statistically significant F/ANOVA
How do you calculate degrees of freedom for ANOVA?
either number of groups - 1
OR
(number of groups in each group) - 1 x number of groups
What is homogeneity of variance role in ANOVA?
Looks at the means across all groups and how much they deviate from the overall mean.
What does ANOVA tell you?
If there is a significant difference between means, but does not tell you where it comes from
Who invented ANOVA?
Sir ronald fisher
List the most commonly used post hoc tests
Turkey Honestly Sig. Diff
Newman-Keuls
Scheffe
Fishers least significant difference
What does between subjects mean?
Each person/group only participates in one group/level of the independent variable e.g one group does method of loci, one group does mnemonics….
What does within subjects mean?
Each group/person participates in EVERY level/group of the IV e.g each person goes through each memory technique to see which is the best
Between-subjects is also known as
Independent groups design
How many degrees of Freedom does the F test have?
2
