Non-Parametric Tests One

Question 1

what are non-parametric tests used for

Answer 1

data that isnt normally distributed

ordinal data is nearly always non-parametric as there isnt a constant difference between two points on the scale

Question 2

whats a non-parametric version of pearsons r and what are they both used for

Answer 2

correlations

spearmans r

Question 3

whats a non-parametric version of paired samples t test

Answer 3

wilcoxon

Question 4

whats an non-parametric version of an unpaired samples t test

Answer 4

mann-whittney u

Question 5

whats a non parameteic version of a repeated measures ANOVA

Answer 5

friedmans

Question 6

whats a non parametric version of between groups ANOVA

Answer 6

kruskal-wallis

Question 7

describe the mann whitney u test

Answer 7

non parametric
unpaired samples
used when theres 1 IV with 2 levels (e.g. 2 cups of coffee, 5 cups of coffee)

we reject the null hypothesis when U is less than the critical value (same as t tests)

Question 8

how do we do a mann whitney u test in SPSS

Answer 8

analyze
nonparametric
independent samples
click box for mann whitney u

Question 9

describe wilcoxon text

Answer 9

related samples test (for within subjects design

(full title - wilcoxon signed rank test)

used when theres only two levels of the IV

Test statistic we are interested in is the smaller of the T values (T+ or T-[may be called negative ranks, positive ranks) - this becomes W

W is compared to the critical values

Question 10

how do we do a wilcoxon in SPSS

Answer 10

analyze
nonparametric
2 related samples