MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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A survey was given to a random sample of 1650 voters in the United States to ask about their preference for a presidential candidate. Of those surveyed, 1089 respondents said that they preferred Candidate A. Determine a 95% confidence interval for the proportion of people who prefer Candidate A, rounding values to the nearest thousandth.
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- In a recent poll, 410 people were asked if they liked dogs, and 44% said they did. Find the margin of error of this poll, at the 95% confidence level.arrow_forwardA political researcher takes a survey of 310 randomly selected registered voters in Orlando, and each person was asked who they plan on voting for in the 2024 presidential election. 110 said they plan on voting for Candidate A, 185 said they plan on voting for Candidate B, and 15 were unsure or plan to vote for another candidate. The researcher wants to construct a 95% confidence interval for the proportion of all registered voters in Orlando who plan to vote for Candidate B. What is the point estimate? Round final answer to 3 decimal places.arrow_forwardA random sample of 1,000 voters was drawn and asked on a bipartisan basis about their voting intentions ahead of the recent animal federal election. A total of 610 people said they would vote for the Cat Party. Calculate the 95% confidence interval for the proportion of voters who intend to vote for the Cat Party. Interpret confidence intervals based on this poll and comment on the chances of the Dog Party returning to power.arrow_forward
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- Of 375 randomly selected students, 30 said that they planned to work in a rural community. Find 95% confidence interval for the true proportion of all medical students who plan to work in a rural community. b. Can you say that more than 10% of the medical students plan to work for a rural area?arrow_forwardFind the sample size, n, needed to estimate the percentage of adults who have consulted fortune tellers. Use a 0.09 margin of error, use a confidence level of 98%, and use results from a prior poll suggesting that 18% of adults have consulted fortune tellers. n=arrow_forwardIn a recent poll of 1,003 people conducted by Ipsos Ipsos (see: https://projects.fivethirtyeight.com/biden-approval-rating/ ), 53% of the respondents disapproved of President Biden. Find a 95% confidence interval for the proportion of all people who disapprove of President Biden. Find a 99% confidence interval for the proportion of all people who disapprove of President Biden. What are the respective margins of errors in parts a) and b) and why are they different?arrow_forward
- Out of 500 people sampled, 235 preferred Candidate A. Based on this, find a 99% confidence level for the true proportion of the voting population (pp) prefers Candidate A.arrow_forwardThe dataset "nurses" is a random sample of 1,000 cases from “Health Care Provider Credential Data” from Washington State Open Data Portal. In the sample, there are 418 CNA's and 278 of the CNA's have expired credentials. Use the statistics from the nurses dataset to answer the following question: "With 90% confidence, what percent of all CNA's on Washington State's healthcare provider list are expired?"arrow_forwardA political candidate has asked you to conduct a poll to determine what percentage of people support her. If the candidate only wants a 2.5% margin of error at a 99.5% confidence level, what size of sample is needed?arrow_forward
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