Question

Professional polling organizations face the challenge of selecting a representative sample of U.S. adults by telephone. This has been complicated by people who only use cell phones and by others whose landline phones are unlisted. A careful survey by Democracy Corps determined the following proportions:
a) What’s the probability that a randomly selected U.S. adult has a landline?
b) What’s the probability that a U.S. adult has a landline given that he or she has a cell phone?
c) Are having a cell phone and a landline independent? Explain.
d) Are having a cell phone and a landline disjoint? Explain.


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  • CreatedMay 14, 2015
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