W2 - One Way ANOVA

Question 1

The first assumption of ANOVA is

Answer 1

Homogeneity of variance: That the variance for each mean is similar. V1=V2=V3

Question 2

The second assumption of ANOVA is

Answer 2

Normality: normally distributed data

Question 3

The third assumption of ANOVA is

Answer 3

Independence of observations: each observation is unique

Question 4

How do we test that means are normally distributed?

Answer 4

Levene’s F test

Question 5

If F test is significant, what do we do?

Answer 5

The null hypothesis of variance being equal in all populations is rejected

Question 6

We represent whole populations with ___ letters and subpopulations with ___ letters

Answer 6

Greek, normal

Question 7

ANOVA provides variance information about 2 things

Answer 7

Variance due to treatment

Variance unrelated to treatment

Question 8

SStotal refers to

Answer 8

Sum of squares of all observations regardless of treatment

Question 9

SStreat refers to

Answer 9

Sum of squares of treatment means around the grand mean multiplied by n

Question 10

SSerror refers to

Answer 10

SStotal -SStreat

Question 11

df refers to

Answer 11

The total independent pieces of data - at least 1

Question 12

k refers to

Answer 12

The number of treatment groups

Question 13

dftreat is

Answer 13

k-1

Question 14

dferror is

Answer 14

N-k

Question 15

dftotal is

Answer 15

N-1

Question 16

Mean Square refers to

Answer 16

Variance

Question 17

Sum of squares (SS2) equation is

Answer 17

(mean-GM)squared

Question 18

MS=

Answer 18

SS/df

Question 19

F test tells us the statistical significance. What is missing?

Answer 19

Psychological significance

Question 20

The underlying model of one way ANOVA is:

Answer 20

X = GM + Tcondition + e

X = GM + Treatment Variance? + SD?

Question 21

Cohen’s d is what kind of measure?

Answer 21

Effect size

Question 22

How is Cohen’s d flawed?

Answer 22

It is positively biased

Question 23

What’s a less biased measure to use instead of Cohen’s d?

Answer 23

Hedges g

Question 24

What’s the basic effect size measure for three or more means?

Answer 24

Cohen’s f

Question 25

What’s the basic measure of strength of association between the dependent and independent variables?

Answer 25

Eta squared (n thingy with a funny long second leg)

Question 26

What is the bias of Eta2?

Answer 26

It is only a sample of a larger population

Question 27

What is a less biased measurement of strength of association?

Answer 27

Omega-squared (woolworths w2)