Researchers Analyzed Eating Behavior and Obesity at Chinese Buffets

Multiple Choice

Researchers analyzed eating behavior and obesity at Chinese buffets. They estimated people's body mass indexes (BMI) as they entered the restaurant then categorized them into three groups---bottom third (lightest) , middle third, and top third (heaviest) . One variable they looked at was whether or not they browsed the buffet (looked it over) before serving themselves or served themselves immediately. Treating the BMI categories as the explanatory variable and whether or not they browsed first as the response, the researchers wanted to see if there was an association between BMI and whether or not they browsed the buffet before serving themselves. They found the following results:
• Bottom Third: 35 of the 50 people browsed first
• Middle Third: 24 of the 50 people browsed first
• Top Third: 17 of the 50 people browsed first
-What is the shape of the resulting null distribution of MAD statistics shown in the output of the Multiple Proportions applet?

A) Symmetric
B) Normal
C) Left skewed
D) Right skewed