xample 6.2.1– Suppose a researcher, interested in obtaining an estimate ofthe average level of some enzyme in a certain humanpopulation, takes a sample of 10 individuals, determinesthe level of the enzyme in each, and computes a samplemean of ݔ=̅22. Suppose further it is known that the variableof interest is approximately normally distributed with avariance of 45. We wish to estimate .