Mathematics, 20.09.2020 15:01 jocelynbarraza
An exit poll in an election is a survey taken of voters just after they have voted. One major use of exit polls has been so that news organizations can try to figure out as soon as possible who won the election, before the votes are officially counted. This has been notoriously inaccurate in various elections, sometimes because of selection bias: the sample of people who are invited to and agree to participate in the survey may not be similar enough to the overall population of voters.
Consider an election with two candidates, Candidate A and Candidate B. Every voter is invited to participate in an exit poll, where they are asked whom they voted for; some accept and some refuse. For a randomly selected voter, let A be the event that they voted for A, and W be the event that they are willing to participate in the exit poll. Suppose that P(W|A) = 0.7 but P(W|A^c ) = 0.3. In the exit poll, 60% of the respondents say they voted for A (assume that they are all honest), suggesting a comfortable victory for A.
Required:
Find P(A), the true proportion of people who voted for A.
Answers: 3
Mathematics, 21.06.2019 14:30
What are the relative frequencies, to the nearest hundredth, of the rows of the two-way table? group 1: a 15 b 45 group 2: a 20 b 25
Answers: 3
Mathematics, 21.06.2019 17:00
Parks is wearing several rubber bracelets one third of the bracelets are tie dye 1/6 are blue and 1/3 of the remainder are camouflage if park swears to camouflage bracelets how many bracelets does he have on
Answers: 2
Mathematics, 21.06.2019 17:30
10 ! in a race, nick is 50 feet in front of jay after ten seconds. how fast can nick run, if jay can run 20 feet per second?
Answers: 1
Mathematics, 21.06.2019 17:30
Monthly water bills for a city have a mean of $108.43 and a standard deviation of $32.09. find the probability that a randomly selected bill will have an amount greater than $155, which the city believes might indicate that someone is wasting water. would a bill that size be considered unusual?
Answers: 1
An exit poll in an election is a survey taken of voters just after they have voted. One major use of...
Mathematics, 08.01.2021 02:00
English, 08.01.2021 02:00
Mathematics, 08.01.2021 02:00
History, 08.01.2021 02:00
Mathematics, 08.01.2021 02:00
Spanish, 08.01.2021 02:00
Mathematics, 08.01.2021 02:00
English, 08.01.2021 02:00
Geography, 08.01.2021 02:00
English, 08.01.2021 02:00
Computers and Technology, 08.01.2021 02:00
Mathematics, 08.01.2021 02:00
History, 08.01.2021 02:00