Consider the universe of infinite number of the digital array chambers filled with an infinite amount of the DNA sample where the true concentration of the target molecules is l per chamber (per 6 nl). The true concentration is an unknown population parameter of this infinite DNA sample. If a chamber gets no molecule then it constitutes failure in the sense of Bernoulli experiment. If it gets one or more molecules, that is, if it gets a ''hit'' and is therefore positive, then it constitutes success. Let the probability of success be p. Note that p is an unknown population parameter. We will use the standard hat notation to denote sample estimators of population parameters. For example, p andl l will denote the estimators of p and l, respectively.