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.
Answer to relevant QuestionsOne way to get around the problem you see in Exercise 9.11 would be to convert the incidence of Down syndrome to ranked data. Replot the data using ranked incidence and calculate the correlation. Is this a Spearman’s ...Expand on Exercise 9.17 to interpret the conclusion that the correlations were not significantly different. Draw a figure using a small number of data points to illustrate the argument that you could have a negative relationship between weight and height within each gender and yet still have a positive relationship for the ...From the previous exercises, do you think that we are able to conclude that low income causes infant mortality? Why would we ever care if a slope is significantly different from 0?
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