Down syndrome is another problem that psychologists deal with. It has been proposed that mothers who give birth at older ages are more likely to have a child with Down syndrome. Plot the data below relating age to incidence. The data were taken from Geyer (1991).

Plot a scatter diagram for the percentage of Down4 syndrome cases (Down/Births) as a function of age.

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Age Births Down 17.5 13555 19.5 8752 21.5 23796 I6 24.5 23986 185 20.5 24807 22860 27.5 19202 29.5 15685 32.5 0983 Births 21450 17450 13954 11987 39.5 396l 415 2276 40.5 Births 7448 5780 1589 45.5 327 44.5 1 Births 596 249