A small-sample (exact) hypothesis test concerning the mean of a Poisson random variable, l, is constructed in the following manner. Suppose the random variable X is a count, modeled by  a Poisson...

A small-sample (exact) hypothesis test concerning the mean of a Poisson random variable, l, is constructed in the following manner. Suppose the random variable X is a count, modeled by  a Poisson random variable. The four parts of the hypothesis test are