6. Telephone Surveys The Pew Research Center reports that they are only able to contact 76% of randomly selected households drawn for telephone surveys. Suppose a pollster has a list of 12 calls to make. Let x represent the number of people successfully contacted. a. What is p, the probability of success, and q the probability of failure? b. Find the expected number of successful calls (the mean). C. Find the standard deviation of the number of successful calls.
6. Telephone Surveys The Pew Research Center reports that they are only able to contact 76% of randomly selected households drawn for telephone surveys. Suppose a pollster has a list of 12 calls to make. Let x represent the number of people successfully contacted. a. What is p, the probability of success, and q the probability of failure? b. Find the expected number of successful calls (the mean). C. Find the standard deviation of the number of successful calls.
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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5.
6. Telephone Surveys The Pew Research Center reports that they are only able to
contact 76% of randomly selected households drawn for telephone surveys.
Suppose a pollster has a list of 12 calls to make. Let x represent the number of
people successfully contacted.
a. What is p, the probability of success, and q the probability of failure?
b. Find the expected number of successful calls (the mean).
C. Find the standard deviation of the number of successful calls.
d. Find the probability that exactly 9 of the calls are successful.
e. Find the probability that at most 9 calls are successful.
f. Find the probability that at least 9 calls are successful.
g. From the list of 12, the pollster is only successful on 4 calls. Is this result
unusual or very unusual (consider the mean and standard deviation)?
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