Top Internet search engines. Nielsen/NetRatings is a global leader in Internet media and market research. In May 2006, the firm reported on the “search” shares (i.e., the percentage of all Internet searches) for the most popular search engines available on the Web. Google Search accounted for 50% of all searches, Yahoo! Search for 22%, MSN Search for 11%, and all other search engines for 17%. Suppose that, in a random sample of 1,000 recent Internet searches, 487 used Google Search, 245 used Yahoo! Search, 121 used MSN Search, and 147 used another search engine.
a. Do the sample data disagree with the percentages reported by Nielsen/NetRatings? Test, using α = .05.
b. Find and interpret a 95% confidence interval for the percentage of all Internet searches that use the Google Search engine.
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