Chapter 3.2, Problem 21AYU

Maternal Age versus Down Syndrome A biologist would like to know how the age of the mother affects the incidence of Down syndrome. The following data represent the age of the mother and the incidence of Down syndrome per $1000$ pregnancies Draw a scatter plot treating age of the mother as the independent variable. Would it make sense to find the line of best fit for these data? Why or why not?

$\begin{array}{cc}\begin{array}{cccc}Age& of& Mother,& x\end{array}& \begin{array}{ccccc}Incidence& of& Down& Syndrom,& y\end{array}\\ 33& 2.4\\ 34& 3.1\\ 35& 4\\ 36& 5\\ 37& 6.7\\ 38& 8.3\\ 39& 10\\ 40& 13.3\\ 41& 16.7\\ 42& 22.2\\ 43& 28.6\\ 44& 33.3\\ 45& 50\end{array}$

Source: Hook, E.B., Journal of the American Medical Association, $249,$ $2034-2038,$ $1983.$