ANOVA

Question 1

When do we use ANOVA?

Answer 1

Compare means of 3 groups

Question 2

What are the assumptions for ANOVA?

Answer 2

Normality (look at histograms and boxplots for modality, symmetry, outliers), Equal variance (Range and IQR are similar, Levene’s test p-value must be greater than .05)

Question 3

What 2 values do we report in ANOVA?

Answer 3

Test statistic (F), p-value

Question 4

Hypotheses for ANOVA?

Answer 4

H0: the means are equal
Ha: At least one pairwise difference exists among the means.

Question 5

Conclusion for ANOVA

Answer 5

There is/isn’t sufficient evidence to support that there’s at least one difference among the mean _____. We reject/fail to reject H0.

Question 6

CI for ANOVA?

Answer 6

We are 95% confident that the mean for _____ for type _____ is between ____ and ____ greater than type _____