Overeating forjust four weeks can increase fat mass and weight over two years later, a Swedish study shows.1 Researchers recruited 18 healthy and normal-weight people with an average age of 26. For a four-week period, participants increased calorie intake by 0 % mostly by eating fast food) and limited daily activity to a maximum of 5000 steps per day (considered sedentary). Not surprisingly, eight and body fat of the participants went up signicantly during the study and then decreased after the study ended. Participants are believed to have returned to the diet and lifestyle they had before the experiment. However, two and a half years after the xperiment, the mean weight gain for participants was 6.8 lbs with a standard error of 1.2 lbs. rh 1Ernersson A., Nystrom F., and Linsstrrom T., "Long-Term Increase of Fat Mass after a Four Week Intervention with a FastFood Hyper- alimentation and Limitation of Physical Activity," Nutrition & Metabolism, 2010; 7: 68. Some of the data is estimated from available information. Part 1 X Your answer is incorrect. (a) Give a 95 % condence interval for the parameter