Truffles are a great delicacy, sending thousands of mushroom hunters into the forest each fall to find them. A set of plots of equal size in an oldgrowth forest in Northern California was surveyed to count the number of truffles (Waters et al. 1997). The resulting distribution is presented in the following table. Are truffles randomly located around the forest? If not, are they clumped or dispersed? How can you tell? (The mean number of truffles per plot, calculated from these data, is 0.60.)

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Number of truffles per plot 00 11 22 33 >3> 3 Frequency 203203 3939 1818 1313 1515