opulation k17 It is important to note that the p-value is an observed random variable that will be dif- ferent for each random sample obtained for a statistical test. Thus, two different analysts could obtain their own random samples and sample means from a process population, and, thus, each would compute a different p-value. Example 9.1 Evaluating a New Production Process (Hypothesis Test) The production manager of Northern Windows, Inc., has asked you to evaluate a pro- posed new procedure for producing its Regal line of double-hung windows. The pres- ent process has a mean production of 80 units per hour with a population standard deviation of er = 8. The manager does not want to change to a new procedure unless there is strong evidence that the mean production level is higher with the new process