MyOpenMath b Search results for 'out of 500 people sampled, 250 had kids. the best point est. b Answered: Bey Out of 500 people sampled, 295 preferred Candidate A. Based on this, estimate what proportion of the voting population prefers Candidate A with 90% confidence. Give your answers as decimals to three places. Submit Question

MyOpenMath b Search results for 'out of 500 people sampled, 250 had kids. the best point est. b Answered: Bey Out of 500 people sampled, 295 preferred Candidate A. Based on this, estimate what proportion of the voting population prefers Candidate A with 90% confidence. Give your answers as decimals to three places. Submit Question

Holt Mcdougal Larson Pre-algebra: Student Edition 2012

1st Edition

ISBN:9780547587776

Author:HOLT MCDOUGAL

Publisher:HOLT MCDOUGAL

Chapter11: Data Analysis And Probability

Section11.4: Collecting Data

Problem 8E

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During the 2004 election year, new polling results were reported daily. In anIBD/TIPP poll of 910 adults, 503 respondents reported that they were optimistic aboutthe national outlook, and President Bush’s leadership index jumped 4.7 points to 55.3(Investor’s Business Daily, January 14, 2004). What is the sample proportion of respondents who are optimistic about thenational outlook? A campaign manager wants to claim that this poll indicates that the majority ofadults are optimistic about the national outlook. Construct a hypothesis test sothat rejection of the null hypothesis will permit the conclusion that the proportionoptimistic is greater than 50%. Use the polling data to compute the p-value for the hypothesis test in part (b).Explain to the manager what this p-value means about the level of significance ofthe results.
A researcher wanted to measure if the voting preferences between the brand of soaps are the different using 5% level of significance. Assume the data is normally distributed.
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In order to estimate the proportion of students that text while driving, a school administrator selects a simple random sample of students from a list of all students at the school who have parking permits. The students are called to the office, one at a time. The administrator asks each student, “Do you text while driving, even though you are not supposed to?” Based on the survey, the administrator estimates that only 2% of students with parking passes text while driving. What potential bias is present in the design of this survey and what is the likely direction of the bias? (A) The sample proportion is likely an underestimate of the population proportion due to response bias. (B) The sample proportion is likely an underestimate of the population proportion due to undercoverage. (C) The sample proportion is likely an underestimate of the population proportion due to nonresponse. (D) The sample proportion is likely an overestimate of the population proportion due to response bias.…
Out of 600 people sampled, 132 preferred Candidate A. Based on this, estimate what proportion of the voting population prefers Candidate A with 95% confidence.
You’ve been hired as a consultant for Spotifly to conduct a survey for them regarding customer satisfaction. From a random selection and poll of 1000 individuals (out of their 718,000 customers), you found that 63% were HIGHLY SATISFIED with Spotifly’s services. Surprisingly, the management team of Spotifly is furious with you and, as they are kicking you out of their building, they yell “At Spotifly, our customers love us! Everyone knows that two-thirds of our customers are HIGHLY SATISIFIED with us!” Hmm… is that really the case? That is, assuming they are right, then how likely is it to observe poll results so far below the true “high satisfaction” rate? (three decimals)
A sample n=4 with scores 42,38,40 and 25 was randomly selected from a population with scores 55,42,46,45,38,49,40,50,40,42,38,35,29,25, what would be the sampling error involved in the selection?
A researcher published this survey result: "74% of people would be willing to spend 10 percent more for energy from a non-polluting source". The survey question was announced on a national radio show and 1200 listeners responded by calling in. Determine whether the study involves selection bias, participation bias, both selection bias and participation bias, or neither. Also describe how the bias would affect the results.
A market research group is interested in estimating the market share of three airline companies, A, B and C, operating on a particular flight path. These three airlines are the only companies operating on this route. Airline B claim that they have 50% of the business with the remaining percentage shared equally amongst airlines A and C, i.e. 25% each. The market research group decide to carry out an independent study and question a random sample of 97 people visiting an airport on a particular day. Each person was given price, timetables and service details of flights on this route for each of the three airlines. Provided with this information they were asked to select their airline of choice.The survey revealed the following observed frequencies Airline A - 26 Aurline B - 49 Airline C - 22 Test if there is any evidence to suggest that the airline's claim is incorrect, at significance level α = 0.05. Complete the test by answering the following questions : Which of the following is the…