Data from the MTF 2006 survey reveal that 71.5% (432 out of 604) of males and 74% (562 out of 756) of females reported trying alcohol. You wonder whether there is any difference between males and females in the population trying alcohol (this variable does not measure regular use, only if the student had ever tried alcohol). Use a test of the difference between proportions when answer these questions.
a. What is the research hypothesis? Should you conduct a one-or two tailed test? Why?
b. Test your hypothesis at the 0.05 level. What do you conclude?