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AQA Psychology Alevel > Inferential testing > Flashcards

Flashcards in Inferential testing Deck (18)
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1

define nominal level data

number of pps in categories which cannot be put in order (e.g. brown eyes, blue eyes)

2

define interval level data

scores of equal intervals (e.g. time in minutes)

3

define ordinal level data

scores that represent each pp and can be put in order - but aren't at set intervals (e.g. ratings 1-10)

4

define type I error

false positive - null hypothesis is true but rejected (investigator claims there is an effect when there is none)

5

define type II error

false negative - null hypothesis is false but accepted (investigator claims there is no effect when there is one)

6

list the levels of data from lowest to highest

nominal, ordinal, interval

7

what is a level of signif

when we are confident enough that results aren't due to chance

8

when are type I errors likely to occur

when probability limits are set too low (e.g. P<0.1)

9

when are type II errors likely to occur

when probability limits are set too high (e.g. P<0.01)

10

give the acronym for choosing stats tests

Simon Cowell Wants Most Singers Receiving Unanimous Praise

11

give the stats tests for nominal level data

Sign test, Chi squared

12

give the stats tests for ordinal level data

Wilcoxen, Mann whitney, Spearman's rho

13

give the stats tests for interval level data

Related t-test, Unrelated t-test, Pearsons r

14

what are the related experimental designs

repeated measures and matched pairs

15

what is the unrelated experimental design

independent groups

16

explain how to calculate S

converting difference in outcome to +/-
take numerical value for least frequent sign

17

explain why statistical testing is used in psychological research

to determine the likelihood that difference found has occurred by chance

18

explain what is mean by 'the results were significant at p<0.05'

less than 5% likelihood results occurred as result of factor that is not the IV (e.g. chance)
- 95 % confidence results occurred due to IV