non-parametric tests

Question 1

What type of distribution does ratio and interval data typically show?

Answer 1

-Normal

Question 2

What type of distribution does ordinal data typically show?

Answer 2

-Not normal

Question 3

Parametric correlation

Answer 3

Pearsons r

Question 4

Non-parametric correlation

Answer 4

Spearman’s rho

Question 5

Parametric 2 samples

Answer 5

Independent sample t-test
Paired sample t-test

Question 6

Non-parametric 2 samples

Answer 6

Mann-Whitney U
Wilcoxon

Question 7

Parametric k samples

Answer 7

ANOVA between groups
ANOVA within groups

Question 8

Non-parametric k samples

Answer 8

Friedmans
Kruskal-Wallis

Question 9

What is the test-statistic for Mann-Whitney?

Answer 9

U

Question 10

How can you figure out distributions from this?

Answer 10

-Order in ascending sequence
-Normal = random distribution
-Not normal = cluster at either end

Question 11

How do we complete a Mann-Whitney test?

Answer 11

1: Rank data as a whole (lowest =1)
2: Total the ranks as two separate totals
3: Calculate U and figure which one is smaller
4: Compare this to critical values table

Question 12

What is the test-statistic for Wilcoxon?

Answer 12

T

Question 13

How do we complete a Wilcoxon test?

Answer 13

1: Calculate difference between conditions
2: Rank differences
3: Calculate total ranks, separate for positive and negative
4: Take the smaller one and compare to critical values table

Question 14

How can we figure out significance from Kruskal-Wallis test?

Answer 14

H0 is true = random distribution of ranks
H0 is false = systematic distribution of ranks

Question 15

What does a Kruskal-Wallis and Friedman’s test tell us?

Answer 15

-That groups differ
-Doesn’t specify which ones