**One-sample z-test:** Test whether a bettor's win rate p-hat differs from the break-even rate p_0. z = (p-hat - p_0) / sqrt(p_0*(1-p_0)/n). - **Two-sample t-test:** Compare means of two groups (e.g., model A performance vs. model B). - **Chi-squared goodness-of-fit:** Test whether observed frequenc