How do I know when to choose which statistical test?

MOID - Mann Whitney U test; ordinal data, independent groups, test of DifferenceSCOR - Spearmans test; test of Correlation, ordinal data, repeated measures or matched pairs designCIND - Chi squared test; independent groups, nominal data, test of Difference
Questions to ask when deciding on which test to use-Is it a test of difference or am I looking for a correlation?Do I have an independent groups, matched pairs or repeated measures design?Is my data ordinal, nominal, or interval/ratio? If interval/ratio data, rank the data and treat it as ordinal.