independent groups

Question 1

what do we test in independent groups

Answer 1

the difference between two sets of ordinal, interval or ratio data

Question 2

what do independent tests tell us

Answer 2

whether the probability of finding this difference between two samples is small enough to reject the null hypothesis

Question 3

what inferential test do we perform if both groups are parametric

Answer 3

parametric test

Question 4

what inferential test do we perform if both groups are non-parametric

Answer 4

non-parametric test

Question 5

what inferential test do we perform if one group is parametric and one is non-parametric

Answer 5

non-parametric

Question 6

design for independent groups

Answer 6

between participants

Question 7

what are independent group

Answer 7

two sets of data from two different groups on the same measure

Question 8

which test do you use for independent groups

Answer 8

depends on the distributions

Question 9

what do you need to describe the data if its parametric

Answer 9

mean & SD

Question 10

what test is used for parametric independent data

Answer 10

t-test

Question 11

what is a t-test used for

Answer 11

to compare the pooled variance of two unrelated groups of samples

Question 12

whats the df for independent groups t-test

Answer 12

(no. of p’s group 1+ no. in group 2) - 2

Question 13

how do you identify if the t-test is significant

Answer 13

compare the value to the t-test critical values table

Question 14

when is the t-test significant

Answer 14

if t is greater than the critical value at .05

Question 15

how to report t test in APA

Answer 15

(t(df) =xx.xx, p=.xxx)

Question 16

what do you need to describe the data for a non-parametric independent groups test

Answer 16

median and IQR

Question 17

what test is used for a non-parametric independent groups test

Answer 17

mann-whitney test

Question 18

what does a mann-whitneey test test

Answer 18

whether the two independent samples were selected from populations that have the same distribution

Question 19

what does mann-whitney test if the distributions are similar

Answer 19

how much the medians differ

Question 20

what does a mann-whitney test is the distributions are different

Answer 20

how much do they differ

Question 21

in a mann-whitney test what do you rank scores by

Answer 21

size from lowest to highest

Question 22

what do we use instead of df for mann-whitney test

Answer 22

n

Question 23

significance of U value - mann-whitney

Answer 23

we want U to be smaller that critical value

Question 24

how to report mann-whitney U in APA format

Answer 24

U= xx.xx, p=

Question 25

how do you rank scores in mann-whitney U

Answer 25

put rank order in next column

Question 26

what is the number of ranks in a Mann-Whitney

Answer 26

how many different scores there are

Question 27

whats the lowest score ranked at in Mann-Whitney

Answer 27

1

Question 28

what are equal scores ranked as

Answer 28

the average rank for that score

Question 29

what do you to to rank mann-whitney after the ranks have been calculated

Answer 29

sort data back into participant order using participant as the sort criterion

Question 30

what do you do after the rank order has been completed in mann-whitney

Answer 30

add up the ranks for each group

Question 31

how do you identify the U value

Answer 31

the lowest of the two rank scores