Branch Out

摘要

It can be difficult to identify the appropriate discrete distribution to use when attempting to determine probabilities in a particular situation.Whether in real life or for exam purposes (such as for the certified quality engineer exam), the decision tree in Figure 1 can help you determine the appropriate distribution.Let's use the following sample test questions to demonstrate the use of the decision tree:Question one: A process is producing material that is 40% nonconforming. Four pieces are selected at random for inspection. What is the probability of exactly one good piece being found in the sample?