Question: As a statistics project, a student examined every cigarette butt along the sidewalk and curb along one block near his home. Of 47 identifiable butts,

As a statistics project, a student examined every cigarette butt along the sidewalk and curb along one block near his home. Of 47 identifiable butts, 22 were Marlboro.
(a) What sampling method is this (if any)?
(b) Is it correct to infer that 47 percent of all smokers prefer Marlboro?
(c) What potential sources of error are likely in this sample?

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