Even though we know it may not be good for us, many Americans really enjoy their fast food! A survey conducted by Pew Research Center graphically illustrated our penchant for eating out, and in particular, eating fast food:

a. This survey was based on "telephone interviews conducted with a nationally representative sample of 2250 adults, ages 18 years and older, 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?
c. If you want to decrease your margin of error to be ± 1%, how large a sample should you take?

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Percentage of Americans who ioften"or "sometimes" overeat junk food All adults 19 36 55 Dine out. 2+ times a week23 38 61 1time a week! '51 38 54 Less than wekly 3 50 Eat fast food... 2+ times a week 33 34 67 1 time a week 22 Less than weekly34 43 65 48 or never Often Sometimes