Reynir examines the difference in the amount of carbon dioxide in 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 og H1 : μ1 - μ2 ≠ 0. Reynir also calculated a confidence interval for the difference between the means of the two groups α and in the hypothesis test). Reynir rejected the null hypothesis. Which of the following applies to the safety margin calculated by Reynir? a) It contains the value zero. b) It contains 95% of the values that can occur when the experiment is performed. c) It does not contain the value zero. d) It contains both values greater than zero and values less than zero

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2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.