Question 1

In this 2-year trial, the scientists randomly assigned 20 moderately obese subjects (mean age,52 years; mean body-mass index [the weight in kilograms divided by the square of the height in meters], 31; male sex, 86%) to one of three diets: low-fat, restricted-calorie; Mediterranean, restricted-calorie; or low-carbohydrate, non-restricted-calorie, and to one of three different sleep habits: long sleep (>10 hours), mid sleep (7-8 hours), short sleep (

A. Determine the experiment unit, the response variable, the factor(s), and level(s).

B. Demonstrate how to carry out experiments for inferring the amount of weight loss of obese subjects in this experiment. Explain why it works.

Question 1 In this 2-year trial, the scientists randomly assigned 20 moderately obese subjects {mean age, 52 years; mean body-mass index [the weight in kilograms divided by the square of the height in meters], 31; male sex, 86%) to one of three diets: low-fat, restricted-calorie; Mediterranean, restricted-calorie; or low-carbohydrate, nonrestricted-calorie, and to one of three different sleep habits: long sleep {>10 hours), mid sleep {7-8 hours), short sleep {