Exam One - annovas Flashcards
ANOVA is used to compare _____ sample means of _______ data
3 or more, continuous
anova provides the probability that 3 or more sets of values are ______
equal
results are provided in the form of…
p values
if p<a, we ____ that all group means are equal and conclude that significant differences exist
reject
for anova results to be valid, the data must meet 2 criteria:
1 - equal variance within groups/samples
2 - normally distributed
ANOVA determines significance by comparing variance within and between samples using the _______ statistic
F statistic
F =
(variability between samples)/(variability within samples)
F statistic and P values are __________ related
inversely
__________ F statistics are more likely to be “statistically significant”
large
How do you increase power of ANOVA?
- increase between sample variability
- decrease within sample variability
- increase sample size
- increase alpha
A statistically significant ANOVA (F test) only tells you…
that at least two of the groups differ
You only do post hoc tests to determine which groups are different if…
the F test is significant
A one way anova is a _____ factor experiement with 3 or more levels
single
A two way anova is a _____ factor experiment and is used to evaluate…
two; the simultaneous effect of 2 independent variables.
main effects
separate effect of one independent variable
