The age category 18–49 is considered a key target for retailers. To illustrate the importance of this age category, Nielsen Ratings tracks the shows that are watched by Americans between the ages of 18 and 49. There are several ways to judge the value to retailers of this age group. Suppose that random samples of Baby Boomers and those born between 1970 and 2000 were asked to report their after-tax income. Is there sufficient evidence that the 18–49 age group has a larger after-tax income that that of Baby Boomers?