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mariomintchev
 2 years ago
Suppose the contact rate for a phone survey is 78% and that 22% of people will participate in that survey. Assume that agreeing or not agreeing to participate is independent of whether the house is contacted.
a) What is the probability that the next house will be contacted and refuse to cooperate?
b) What is the probability of failing to contact a house, or making contact and not getting them to agree to the interview?
mariomintchev
 2 years ago
Suppose the contact rate for a phone survey is 78% and that 22% of people will participate in that survey. Assume that agreeing or not agreeing to participate is independent of whether the house is contacted. a) What is the probability that the next house will be contacted and refuse to cooperate? b) What is the probability of failing to contact a house, or making contact and not getting them to agree to the interview?

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mariomintchev
 2 years ago
Best ResponseYou've already chosen the best response.0I got 60.84 for A...

Muffledfarts
 2 years ago
Best ResponseYou've already chosen the best response.0If no one else helps you, khanacademy.com may be a useful source. How to do this has slipped my mind. :/

phi
 2 years ago
Best ResponseYou've already chosen the best response.1a) prob of contacting is 0.78 * prob refuse (1 0.22)= 0.6084 or 60.84% looks good for (b), draw a probability tree dw:1346975875363:dw

mariomintchev
 2 years ago
Best ResponseYou've already chosen the best response.0is that right or am i doing it wrong?

phi
 2 years ago
Best ResponseYou've already chosen the best response.1Sounds good. The other way to think of it, is 1 prob(interview) 1  0.78*0.22= 82.84 also, if we fill in the "leaves" of the tree, they should (and do) add to 1: 0.22 0.6084 0.1716
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