cognitive methods

Question 1

what is inferential statistics

Answer 1

• we want to be sure that our results are caused by the thing we are manipulating and not a coincidence

Question 2

what is probability

Answer 2

the chance of something happening
- expressed as a number between 0-1 written as p
- if results are because of your study and not just by chance IV did affect DV

Question 3

why do you do a stats test

Answer 3

• let us know whether results are based on luck/chance or because there is actually a link between IV & DV

Question 4

what is a type 1 error

Answer 4

false positive
p value is too low
think results were significant but they weren’t

Question 5

what is a type 2 error

Answer 5

false negative
p value too high
think results aren’t significant but they are

Question 6

when do you use a mann whitney

Answer 6

when a study
- has independent measures design
- looking for a difference
- uses ordinal/interval data

Question 7

when are results significant

Answer 7

when calculated value is smaller than critical value

Question 8

when do you use a wilcoxon

Answer 8

ordinal data
looking for a difference
repeated measures