ANOVA ASSUMPTIONS
In an experiment with 3 comparison groups, a researcher would like if each of the groups have the same variance, such that _________ is met.
The assumption of homogeneity of variances
Name three different Post hoc tests used in SPSS.
Tukey’s test, Games-Howell test, and Scheffe’s test
What is the mode of this set of data?
2, 3, 5, 2, 4, 3, 6, 2
2
What is a type 1 error?
The null hypothesis is rejected when it shouldn’t have been.
5, 6, 8, 3, 2, 5, 6, 8, 9, 5, 1
What is the Mean, Median, and Mode of this set of data?
Mean: 5.27
Median: 5
Mode: 5
During an experiment where researchers are investigating the impact of colour on mood, one of the researchers allows the participants to communicate with each other. This may allow _________________ to occur.
Violations of (Error) Independence
What Posthoc comparison should be used when homogeneity of variance is violated?
Games-Howell test
A ______________ is an outside influence that changes the effect of a dependent and independent variable
Confounding variable
How many independent variables does a mixed design contain?
2
In a One-Way ANOVA, by selecting to perform a Homogeneity variance test in SPSS, you will be provided with _________
Levene’s Statistic
What are the main differences between Planned Contrasts and Post Hoc comparisons?
Planned comparisons are often planned prior to data collection, such as in user-defined contrasts, whereas, post hoc comparisons are conducted after data has been collected and is used to compare all possible pairwise differences
What is the sample size of students in the Faculty of Arts in this population?
Bio students: 3, History students: 4,
Business: 5, English: 6, Chem: 6, Criminology: 4
14
Rank the following from lowest to highest power: Games-Howell, Scheffe, and Tukey
Scheffe, Games-Howell, Tukey
The Welch or Brown-Forsythe Tests in SPSS adjust the degrees of freedom to become a smaller value, therefore creating a larger _________.
F ratio
An experimenter has three groups, 1, 2, and 3. He wants to compare the 1st group to the second group, he assigns the following weights: Group 1 = -1, group 2 = -1, group 3 = 0. Which rule to assigning weight in a planned comparison is being violated in the example?
Rule 1: Groups coded with positive weights are compared with groups given negative weights
Which of the following statements are true?
I. All variables can be classified as quantitative or categorical variables.
II. Categorical variables can be continuous variables.
III. Quantitative variables can be discrete variables.
I and III
What information does a significant interaction provide in regards to the main effects?
A significant interaction shows that the main effects are overly simplified.