In a market test of a new chocolate raspberry coffee, a poll of 400 people from San Diego showed 250 preferred the new coffee. In Irvine, 170 out of 350 people preferred the new coffee. Researcher wants to test the hypothesis that there is no difference in preferences between the two cities.
What are the null and alternative hypotheses for this study, symbolically?
What is the p-value?
What is your decision if a=0.05? State your conclusion.