When an opinion poll calls landline telephone numbers at random, approximately 30% of the numbers are...
When an opinion poll calls landline telephone numbers at random, approximately 30% of the numbers are working residential phone numbers. The remainder are either non-residential, non-working, or computer/fax numbers. You watch the random dialing machine make 20 calls. Round all answers to four decimal places.
Blank #1: What is the probability that exactly three calls reach working residential numbers?
Blank #2: What is the probability that at most three calls reach working residential numbers?
Blank #3: What is the probability that at least three calls reach working residential numbers?
Blank #4: What is the probability that fewer than three calls reach working residential numbers?
Blank #5: What is the probability that more than three calls reach working residential numbers?
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When an opinion poll calls landline telephone numbers at random,
approximately 30% of the numbers are...
A telephone survey uses a random digit dialing machine to call subjects. The random digit dialing...
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A survey of Chicago. A New Yonk Times/Kaiser founda tion survey of Chicagoans showed that they are deeph the sample Is lU Kalsdeept 28 dissatisfied with the direction of their city, distrustful their police force, and divided along racial lines. The poll is based on telephone interviews conducted April 21- May 3, 2016, with 1123 adults who live in Chicago. The samples of telephone exchanges for both landlines and cell phones were randomly selected by a computer from a complete...
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