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(a) Do people sleep better when they have a glass of milk before bed? A random sample of PEI adults was selected. Each drank a glass of milk before going to bed and recorded how long they slept that night. Two nights later they went to bed without drinking milk and recorded how long they slept that night. O A. Hypothesis test for difference in means (independent populations) O B. Hypothesis test for the mean O C. Confidence interval for the mean D. Method not listed O E. Hypothesis test for paired data (b) Is the percentage of people who believe in UFO's more than 20%? A random sample of Canadians was chosen and each was asked if they believe in UFO's. O A. Hypothesis test for difference in means (independent populations) O B. Hypothesis test for the mean O C. Confidence interval for the mean O D. Method not listed O E. Hypothesis test for paired data