3. A consumer organization studied the effect of age of automobile owner on cash offer for a used car (in hundreds of dollars). The age groups were "Young" (Y ), "Middle"' (M), and "Old" (O). Summary statistics follow: M O Y Overall sample mean 27.75 21.42 21.50 23.56 sample std. dev 1.29 1.68 1.73 3.38 sample size 12 12 12 36 Data Source: "Applied Linear Statistical Models", Kutner, Nachtsheim, Neter