Discussion

> Par Inc. is a major manufacturer of golf equipment; management believe that Par's market share would increase with the introduction of a cut resistant, longer lasting golf ball. The research group at Par then began investigating a new golf ball coating to serve these two purposes; however, one of the researchers wondered about the effect of the new coating on driving distances. Hence a testing on 40 balls of both the new and current models were performed with a mechanical hitting machine. Any difference between the mean distances for the two models could be attributed to a difference in the two models. The data collected from the testing helped management make a hypothesis test and statistical summaries for the two models. These provided the population mean driving distance of each model and the difference between the means of the two populations. In this chapter, you'll learn how to construct interval estimates and test hypothesis about means and proportions with two populations. You'll also learn techniques to analyze independent random samples and matched samples.