Question: One sided or two? In each of the following situations, is the alternative hypothesis one-sided or two-sided? What are the hypotheses?

a) A business student conducts a taste test to see whether students prefer Diet Coke or Diet Pepsi.

b) PepsiCo recently reformulated Diet Pepsi in an attempt to appeal to teenagers. They run a taste test to see if the new formula appeals to teenagers more than the standard formula.

c) A budget override in a small town requires a two-thirds majority to pass. A local newspaper conducts a poll to see if there's evidence it will pass.

d) One financial theory states that the stock market will go up or down with equal probability. A student collects data over several years to test the theory.