RS11- Statistical tests and SPSS output

Question 1

Dependent means t-test

Answer 1

related/repeated measures t-test - pp’s take part in all conditions.

• continuous scale (interval/ratio)
• two related groups or matched pairs
• approximately normally distributed

Question 2

Independent means t-test

Answer 2

between / independent groups - different pp’s take part in each condition.
- groups must show homogeneity of variance

Question 3

Wilcoxon

Answer 3

• Within subjects design
• Not normally distributed
• Non parametric test
• Obtain difference scores and rank them

Question 4

Mann Whitney

Answer 4

• Between subjects design
• Not normally distributed
• Data is in the form of ranks
• Group sizes differ
• Between subjects design

Question 5

One way independent ANOVA

Answer 5

• Each pp only takes place in one condition (between subjects)
• More than two groups of subjects
• Test of HOV: levenes test

Question 6

One way repeated measures ANOVA

Answer 6

• Same subjects used in each condition

- Some variation come from the experimental manipulation

Question 7

Chi square

Answer 7

• Categorical data
• Analyses in the form of frequencies
• Test of association
• Expected frequencies should not fall below 5.

Question 8

Fishers exact

Answer 8

Used when the expected cell frequencies fall below 5.

Question 9

McNemar test

Answer 9

Used when pp’s have contributed observations to more than one cell. Includes observations where opinions change. Repeated measures design.