7.1 Identifying the Target Parameter
Many experiments involve a comparison of population means. For instance, a sociologist may want to estimate the difference in mean life expectancy between inner-city and suburban residents. Or a consumer group may want to test whether two major brands of food freezers differ in the average amount of electricity they use. Or a professional golfer might be interested in comparing the mean driving distances of several competing brands of golf balls travel when struck with the same club. In this chapter, we consider techniques for using two (or more) samples to compare population means.
The same procedures that are used to estimate and test hypotheses about a single population can be modified to make inferences ...
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