In which of the following situations should the chi-square Test for Homogeneity be used?   -A researcher is trying to determine if salaries for men and women in the tech industry have the same distribution. He surveys a random sample of men and women in the industry and records the distribution of salaries for each gender. He wants to determine if the distributions are the same.   -A referee wants to make sure the coin he uses for the opening coin toss is fair. He flips the coin 30 times and compares the number of heads and tails with the numbers he would expect to get if the coin were fair.   -An online survey company puts out a poll asking people two questions. First, it asks if they buy physical CDs. Second, it asks whether they own a smartphone. The company wants to determine if there is a relationship between the buying physical CDs and owning a smartphone.

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