BusinessWeek reported that there seems to be a difference by age group in how well people like life in Russia (BusinessWeek, March 10, 2008). The following sample data are consistent with the BusinessWeek findings and show the responses by age group to the question: "Do you like life in Russia?"

a. What is the point estimate of the proportion of Russians aged 17 to 26 who like life in Russia?
b. What is the point estimate of the proportion of Russians aged 40 and over who like life in Russia?
c. Provide a 95% confidence interval estimate of the difference between the proportion of young Russians aged 17 to 26 and older Russians aged 40 and over who like life in Russia.

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Russlan Age Group Sample Responded Yes 17-26 300 192 40 and over 260