ANOVA independent two variables

Question 1

p> .05 means
p<.05 means

Answer 1

retain
reject

Question 2

Avoid type 1 error by…

Answer 2

making alpha level more conservative (smaller)

LOWER alpha = LOWER probability of type 1 error

BUT this decreases power, increases chance of type2

Question 3

0.05

Answer 3

accepting that we will make a type 1 error 5% of the time

Question 4

avoid type 2 errors by….

Answer 4

by making alpha less conservative
= larger
- beta

Question 5

how to increase statistical power?

what is power?

Answer 5

power = chance of correctly rejecting a null hypothesis
power = 1- beta
1. increase the effect size
2. increase sample size

also reduces type 2

Question 6

two-factor ANOVA is

Answer 6

simultaneous influence of two or more independent variables on a dependent variable

Question 7

main effect vs interaction effect

Answer 7

main effect = variable A, B
interaction effect = A xB

Question 8

how to calculate the Number of sample groups required:

Answer 8

number of levels of IV A, multiplied by number of levels of IV B
eg 2 chocolate (100g, 0g) x2 (puppies, no puppies) =4

Question 9

with no significant interaction effect - slopes are the same…

Answer 9

you dont need to do post-hoc if 2 levels of IV

Question 10

ANOVA assumptions with more than 1 IV:

Answer 10

between - same as between
repeated - same as repeated measures

Question 11

Effect size ANOVA

Answer 11

• use n2partial for each effect/level when more than 1 IV
• proportion of variance explained by each effect after partialing out the others