It has been argued that many cases of infant mortality rates are caused by teenage mothers who, for various reasons, do not receive proper prenatal care. From the Statistical Abstract of the United States we have statistics on the teenage birth rate (per 1000) and the infant mortality rate (per 1000 live births) for the 48 contiguous states. The data are given in Table 7.20, where Teen denotes the birthrate for teenage mothers and Mort denotes the infant mortality rate.
(a) Perform a regression to estimate Mort using Teen as the independent variable. Do the results confirm the stated hypothesis? Interpret the results.
(b) Construct a residual plot. Comment on the results