chpt 13 review Flashcards
What are the different types of situations do we use just ANOVA
- single factor ANOVA (completely randomzied design)
- Randomized block design
- Factorial experiment
Why do we use single factor (completely randomized design) for?
Do all 3 populations come from the same pop
what is the null hypothesis for a single factor ANOVA
Ho: M1=M2=M3
Ha: Not all pop means are equal
What is a key word for ANOVA
Avg or Mean = Randomized block design
What test do we use for significance for ANOVA
F test
What is the formula for the F test
MSTR/MSE
If we reject Ho for a single factor ANOVA, what can we conclude
that the means of 3 pops are NOT equal
there is a significant difference b/w at least one mean
If not all means are equal in a single factor ANOVA, what can we do
- use fisher’s LSD (a multiple comparsson procedure)
What is the HO for Fisher’s LSD
Ho: Mi = Mj
What is the test for LSD
xbar1 -xbar 2 compare to lsd = ta/2 x square root of MSE (I/n + 1/n)
remember ta/2 is dividing the a by 2
- use df = total - k
What is the degrees of freedom for LSD
total - k
WHat is the randomized block design used for
to remove variation form the MSE term
what is the null hypothesis for the randomized block design
M1=M2=M3 (same as single factor ANOVA)
If we reject Ho for randomized block design, what can we say
conclude that the mean for the 3 differ
How do you calculate overall mean
do it and check sheet