# Fisher’s Exact Test

Fisher’s Exact Test

Fisher’s Exact Test is a useful tool when dealing with smaller sample sizes.  It allows a researcher to use the hypergeometric distribution to calculate a p-value when the assumptions from the $\chi^{2}$ test do not apply (e.g. small cell counts).  This example walks through the calculations to compute the probability density and cumulative density using Fisher’s classic Tea Drinker data.