Research

Question 1

Tests of camparison:
ANOVA
Analysis of covariant 
Chi sq
Spearmans rho 
T test

Answer 1

ANOVA compares 3 or more Tx groups
Analysis of covariant compares 2 or more and controls for effects of intervening variable
Chi sq compares data in freq counts (usually % of a population)
Spearmans rho correlates ordinal data
T test: one indep and one depen variable