CyberShopping. It has become more common for shoppers to “comparison shop” using the Internet. Respondents to a Pew survey who owned cell phones were asked whether they had, in the past 30 days, looked up the price of a product while they were in a store to see if they could get a better price somewhere else. Here is a table of their responses by income level.

*$30K $30K–$49.9K $50K–$74.9K +$75K Yes 207 115 134 204 No 625 406 260 417

a) Find the conditional distribution (in percentages) of income distribution for those who do not compare prices on the Internet.

b) Find the conditional distribution (in percentages) of income distribution for shoppers who do compare prices.

c) Create a graph comparing the income distributions of those who compare prices with those who don’t.

d) Do you see any differences between the conditional distributions? Write a brief summary of what these data show about Internet use and its relationship to income.