The percentages of American adults who have earned an annual salary over $200,000 at least once in their lives are shown in Table 14 for various years. Let p be the percentage of American adults at age a years who have earned an an- nual salary over $200,000 at least once in their lives.
a. Construct a scatterplot.
b. Is the association positive, negative, or neither? What does that mean in this situation? Why does that make sense?

c. Graph the model p = 0.93a - 23.46 on the scatterplot. Does it come close to the data points?
d. Use the model to estimate the percentage of 32-year- old Americans who have earned an annual salary over $200,000 at least once.
e. Use the model to predict at what age one-fourth of American adults have earned an annual salary over $200,000 at least once.

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Table 14 Percentage of American Adults Who Have Earned over $200,000 at Least Once Age Percent 25 30 35 40 13 18 24 28 32 50 60