Reynir explores differences in the amount of carbon dioxide in two types of mineral water. He conducts a two-sample t-test to compare the average carbon dioxide levels in the two groups. The...

Extracted text: Reynir explores differences in the amount of carbon dioxide in two types of mineral water. He conducts a two-sample t-test to compare the average carbon dioxide levels in the two groups. The hypotheses are Ho: u1 - u2 = 0 and H1: u1 - u2 + 0. Reynir also calculated a confidence interval for the difference between the averages of the two groups (and used the same a as in the test). Reynir rejected the null hypothesis. Which of the following applies to the confidence interval that Reynir calculated? 1. It contains the value zero. 2. It contains 95 % of the values that could occur when the experiment is performed. 3. It does not contain the value zero. 4. It includes values greater than zero and values less than zero. 5. R-command: