9. Fast Food! Even though we know it may not be good for us, many Americans really enjoy their fast food! A survey conducted by Pew Research Center23 graphically illustrated our eating habits, and in particular, our appetite for fast food:

a. This survey was based on “telephone interviews conducted with a sample of 2250 adults living in continental U.S. telephone households.” What problems might arise with this type of sampling?

b. How accurate do you expect the percentages given in the survey to be in estimating the actual population percentages? (hint: Find the margin of error.)

c. If you want to decrease your margin of error to be 61%, how large a sample should you take?

Percentage of Americans who "often" or "sometimes" overeat junk food All adults 19 36 55 Dine out.... 2+ times a week 23 38 61 1 time a week 16] 38 54 Less than weekly or never 18 32 50 Eat fast food... 2+ times a week 33 34 67 1 timp a week 22 43 65 48 Less than weekly or never 14 34 Often Sometimes Source: Pew Research Center, pewsocialtrends.org