A survey asked randomly selected drivers if they would be willing to pay higher taxes on gasoline as long as all of the additional revenue went to improving roadways. Among the 41 males surveyed, 12 responded "Yes." Of the 59 females surveyed, 21 responded "Yes." Let p 1 be the population proportion for males, and let p 2 be the population proportion for females. To test the alternative hypothesis H a : p 1 p 2 < 0 , what is the critical value? Use the level of significance = 0.01 and round your answer to two decimal places. z z 0.10 z z 0.05 z z 0.025 z z 0.01 z z 0.005 1.282 1.645 1.960 2.326 2.576