A week before a state election, a random sample of voters from City J and a random sample of voters from City K were taken. Of the 100 voters selected from City J, 65 indicated they were supporting a certain candidate for state senate. Of the 125 voters selected from City K. 75 indicated they were supporting the candidate.
Which of the following is the correct test statistic for a two-sample z-test for a difference in population proportions for the two cities (J minus K) in their support for the candidate?
a. 0.65-0.60 / √(0.65)(0.6)(1/100+ 1/180)
b. 0.65-0.60 / √(0.62)(0.38)(1/100+ 1/125)
c. 0.65-0.60 / √(0.65)(0.38)(1/100 + 20)
d. 65-75 / √(0.65)(0.68)(1/100 + 120)
e. 65-75 / √0.62/100 + 0.35/125
