Reconsider Exercises 8.1.23 and 8.1.25 on cellphone and smartphone ownership. We considered our population to be that of all adults in the U.S. Now suppose we want the population to be all the cellphone users in the U.S.
a. Combine the results in the tables from these two exercises so you have a new two-way table where race is the explanatory variable and the response variable is whether or not someone owns a smartphone given that they own a cellphone.
b. What proportion of the cellphone owners of each race own smartphones?

Data from Exercise 8.1.23

Data from Exercise 8.1.25

In a September 2013 poll conducted by the Pew Research Center, they asked a random sample of U.S. adults if they owned a smart phone. The results are shown in the following table by race.

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White Black Hispanic Total 3,801 Own a cellphone? Yes 5,026 614 611 No 53 422 68 543 Total 4,223 664 682 5,569 White Black Hispanic Total Yes Own a 2,238 372 382 2,992 smartphone? 1,985 292 2,577 No 300 4,223 664 682 Total 5,569