Suppose a political scientist is interested in whether wealth is a determining factor in the individual’s propensity to vote. A random sample of 500 people who earned $ 100,000 or more showed that 390 voted, whereas a random sample of 400 people who earned less than $25,000 showed that 280 voted.

Test, at the 10 % level of significance, the null hypothesis that the two population voting rates are equal against the alternative hypothesis that the voting rate is higher for people earning $ 100,000 or more.