non parametric tests

Question 1

when do we use non parametric tests?

Answer 1

when assumptions are not met for parametric

Question 2

non parametric test for independent t test?

Answer 2

Mann Whitney U

Question 3

non parametric tests for related t test?

Answer 3

Wilcoxon signed-ranks

Question 4

non parametric test for Pearson’s product-moment correlation

Answer 4

spearman’s rho

Question 5

when is non parametric tests appropriate to use

Answer 5

non normal distribution of data
outliers
small sample size
interval ratio or ordinal- DATA IS RANKED

Question 6

Mann whitney U and Wilcoxon - effect sizes?

Answer 6

you have to calculate by hand

Z score divided by sqaure root of N

Question 7

In spss for Mann whitney U tests when do you use which sig

Answer 7

when sample is below 40 you use exact sig 2

Question 8

when we report results of Mann whiteny U tests what do we report

Answer 8

U SCORE
Z SCORE
P SCORE (sig)
EFFECT SIZE- u need to calculate- last sentence
MEDIANS (u have to ask spss to do this seperatly)

Question 9

what do we report for wilcoxon

Answer 9

remember it gives u 2 tailed so if u did 1 tailed half the number to get you p value
Z SCORE
P SCORE (sig)
EFFECT SIZE (need to calculate- remembering N is total number of observations- often having to multiply N)

Question 10

effect size for correlation

Answer 10

small-0.1-0.29
medium-0.3-0.49
large-0.5- 1

Question 11

hypothesis in mann whiteny u

Answer 11

talk about the medians first- will they be equal or different?