Rey examines the difference in the amount of carbon dioxide in the two types of mineral water. He performs a two-group t-test to compare the average carbon dioxide levels in the two groups. His hypotheses are H0: μ1 −μ2 = 0 and H1: μ1 −μ2 ̸ = 0. Rey also calculated a confidence interval for the difference between the means of the two groups (and used the same α as in the hypothesis test). Rey rejected the null hypothesis. Which of the following applies to the safety margin calculated by Rey?   It contains the value zero. It contains 95% of the values that can occur when the experiment is performed. 3. It does not contain the value zero. It contains both values greater than zero and values less than zero. I do not know.

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