Question
3. A market research firm conducts telephone surveys with a 40% historical response rate. a.What is the sampling distribution, mean, and standard deviation of, the
3. A market research firm conducts telephone surveys with a 40% historical response rate.
a.What is the sampling distribution, mean, and standard deviation of, the proportion of individuals who respond to these surveys in a sample of 400 telephone numbers?
b.Calculate the probability that in a new sample of 400 telephone numbers, at least 150 individuals will cooperate and respond to the questions?
Hint: What is the probability that the sample proportion will be at least 150/400 = 0.375?
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Essentials Of College Algebra
Authors: Margaret L Lial, John E Hornsby, David I Schneider, Teresa McGinnis
10th Edition
0321970632, 9780321970633
