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One of the biggest issues facing e-retailers is the ability to turn browsers into buyers (M

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One of the biggest issues facing e-retailers is the ability to turn browsers into buyers (M. Totty, "Making the Sale," The Wall Street Journal, September 24, 2001, R6.) This is measured by the conversion rate, the percentage of browsers who buy something in their visit to a site. This article reported that the conversion rate for 11bean.com was 10.1% and for victoriasecret.com was 8.2%. Suppose that each of these sites were redesigned in an attempt to increase their conversion rates. Samples of 200 browsers at each redesigned site were selected. Suppose that 24 browsers at 11bean.com made a purchase and 25 browsers at victoriasecret.com made a purchase.

a) Is there evidence of an increased conversion rate at 11bean.com at the 0.05 level of significance?
b) Is there evidence of an increased conversion rate at victoriasecret.com at the 0.05 level of significance?