1-Way ANOVA Quiz
Besides a 1-way ANOVA what are the other two types of ANOVA tests?
2-way and nested
A 1-way ANOVA bar graph's y axis represents what?
Mean
What does MS represent?
Mean squares
Can a 1-way ANOVA be checked in Excel?
No
What two plots are used for validation?
Normal probability and residual plots
What must residuals be in an NPP for validation?
Normally distributed
What are the two assumptions needed for a 1-way ANOVA?
Normally distributed and variance is equal among samples
How are degrees of freedom calculated for SSb?
Number of categories minus one
How are the degrees of freedom calculated for SSw?
Number of observations minus the number of categories
How many bars per category should be on a bar graph?
One
What variables are necessary for a 1-way ANOVA test?
One quantitative and one qualitative
What formula is used to determine MSb?
SSb divided by dfb
What formula is used to determine MSw?
SSw divided by dfw
Which test determines the difference in mean between exactly 2 samples?
T-test
What does SSw represent?
Within sum of squares
The null hypothesis for 1-way ANOVA states what?
All means are equal
What does ANOVA stand for?
Analysis of Variance
What does SSb represent?
Difference between sum of squares
What does a 1-way ANOVA test for among groups?
Difference in means
What are two graphs that can be used for 1-way ANOVA?
Bar and boxplot
What test is used to determine variances among samples?
Bartlett's Test
How should data be presented in a 1-way ANOVA?
By sample
What must residuals have to be validated?
Constant variance
How many samples must be available for an ANOVA?
Greater than or equal to 2
If samples are not normally distributed what test is more appropriate?
Kruskal-Wallace Test
What should be used in a graph to show significance?
Letters
What does SStot represent?
Total sum of squares
If the ANOVA is significant what test is done to determine which categories are different?
TukeyHSD post-hoc test
