Question

The consumer research firm Scarborough analyzed the 10% of American adults that are either “ Superbanked” or “ Unbanked.” Superbanked consumers are defined as U. S. adults who live in a household that has multiple asset accounts at ­financial institutions, as well as some additional investments; ­Unbanked consumers are U. S. adults who live in a household that does not use a bank or credit union. By finding the 5% of ­Americans that are Superbanked, Scarborough identifies financially savvy consumers who might be open to diversifying their financial portfolios; by identifying the Unbanked, Scarborough provides ­insight into the ultimate prospective client for banks and financial institutions. As part of its analysis, Scarborough reported that 93% of Superbanked consumers use credit cards in the past three months as compared to 23% of Unbanked consumers. (Data extracted from bit. ly/ QlABwO.) Suppose that these results were based on 1,000 ­Superbanked consumers and 1,000 Unbanked consumers.
a. At the 0.01 level of significance, is there evidence of a significant difference between the Superbanked and the Unbanked with respect to the proportion that use credit cards?
b. Find the p value in (a) and interpret its meaning.
c. Construct and interpret a 99% confidence interval estimate for the difference between the Superbanked and the Unbanked with respect to the proportion that use credit cards.


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  • CreatedJuly 16, 2015
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