Florida County Data (Appendix C.4). You are investigating a possible association between infant mortality rates (RATE_1416) and household income (INCOME_15). Divide the counties into four groups of...

Florida County Data (Appendix C.4). You are investigating a possible association between infant mortality rates (RATE_1416) and household income (INCOME_15). Divide the counties into four groups of nearly equal size using the quartiles of income. Investigate whether the distribution of mortality rates differs between these groups. Use nonparametric techniques, rather than attempting to transform mortality rates in some way to achieve normality.