Heuristic #9: THE LAW OF SMALL NUMBERS. Our brains have a difficult time with statistics. Small samples are more prone to extreme outcomes than large samples, but we tend to lend the outcomes of small samples more credence than statistics warrant. System 1 is impressed with the outcome of small samples but shouldn’t be. Small samples are not representative of large samples. Large samples are more precise. We err when we intuit rather than compute, (see page 113). Potential for error? We make decisions on insufficient data.