The research department of Coca Cola did a study to determine if there was a difference in the proportion of men who preferred Coke vs. women who preferred Coke.

At the .10 significance level, is there a significant difference in the proportions of the preference for Coke between Men vs. Women?

75 out of 400 men preferred Coke over Pepsi. 25 out of 250 women preferred Coke over Pepsi.

What are the null and alternative hypotheses?