Inferential tests and levels of data

Nominal data and independent groups

Chi squared

Nominal data and repeated measures/matched pairs

Sign test

Interval/ordinal and independant groups

Mann Whitney

Interval/ordinal and repeated measures/matched pairs

Wilcoxin

Correlations

Spearman’s rank

Define nominal level data

Data which describes number of items in a category (e.g the number of british people in a race)

Define ordinal level data

Data that can be ranked or ordered, (e.g where the runners come in the race, or point on a happiness scale NOTE: the difference in times between 1st and 2nd is probably larger then the difference in time between 4th and 5th

Define interval level data

Data on a scale which has equal gaps between the points (e.g a measurement, length, time, degrees)

Which is the highest level of data

Interval - most useful