A dollar store is a no-frills retailer that sells many goods for one dollar. The percentages of households in various in- come groups that shop at dollar stores are shown in Table 27.

Let p be the percentage of households with an income of d thousand dollars that shop at dollar stores.
a. Construct a scatterplot.
b. Describe the four characteristics of the association. Compute and interpret r as part of your analysis.
c. Graph the model p = -0.33t + 78.39 on the scatterplot. Does it come close to the data points?
d. What is the p-intercept? What does it mean in this situa- tion? Do you have much faith in your result? Explain.
e. At what incomes do more than half of households shop at dollar stores?

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Table 27 Households That Shop at Dollar Stores Household Income Used to Income Group (thousands of dollars) Represent Percentage of Households That Shop at of dollars)Dollar Stores Income Group thousands 0-19.999 20-29.999 30-39.999 40 49.999 50 69.999 10 25 35 45 60 100 74 71 67 64 58 45 70+