Inferential Statistics: Choosing the Right Test
Choosing statistical tests
Real World
A psychologist comparing craving scores between two independent groups of smokers (NRT vs. placebo) would use Mann-Whitney U; if correlating number of cigarettes smoked with anxiety scores, they would use Spearman's rho.
Exam Focus
Memorise the decision tree: difference vs. correlation, then design type (independent/repeated), then data level — work through it systematically.
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