In a survey of 2025 adults in a certain country conducted during a period ofeconomic uncertainty, 63% thought that wages paid to workers in industry weretoo low. The margin of error was 3 percentage points with 95% confidence. Forparts (a) through (d) below, which represent a reasonable interpretation of thesurvey results? For those that are not reasonable, explain the flaw.(a) We are 95% confident 63% of adults in the country during the period ofeconomic uncertainty felt wages paid to workers in industry were too low.Is the interpretation reasonable?A. The interpretation is reasonable.OB. The interpretation is flawed. The interpretation indicates that the levelof confidence is varying.OC. The interpretation is flawed. The interpretation provides no intervalabout the population proportion.D. The interpretation is flawed. The interpretation suggests that thisinterval sets the standard for all the other intervals, which is not true.

Total number of adults=2025 proportion of workers who thought that wages paid were too low=0.63…

Answered: In a survey of 2025 adults in a certain…

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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According to a poll, 86% of California adults (434 out of 506 surveyed) feel that education is one of the top issues facing California. We wish to construct a 90% confidence interval for the true proportion of California adults who feel that education is one of the top issues facing California. Find a 90% confidence interval for the population proportion. (Round your answers to three decimal places.) X * Enter a number.
A recent survey showed that 42% of US employers were likely to require higher employee contributions for health care coverage. Suppose the survey was based on a sample of 500 companies. Find the 99% confidence interval for the proportion of all companies likely to require higher employee contributions for health care coverage. (Round to four decimal places)
21. Listening to music has long been thought to enhance intelligence, especially during infancy and childhood. To test whether this is true, a researcher records the number of hours that eight high-performing students listened to music per day for 1 week. The data are listed in the table. Music listening per day (in hours) 4.2 4.8 5.0 3.8 4.2 5.5 4.1 4.4 1. Find the confidence limits at a 95% CI for this sample. 2. Suppose the null hypothesis states that students listen to 3.5 hours of music per day. What would the decision be for a two-tailed hypothesis test at a 0.05 level of significance?
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In a survey of 2075 adults in a certain country conducted during a period of economic uncertainty, 67% thought that wages paid to workers in industry were too low. The margin of error was 3 percentage points with 95% confidence. For parts (a) through (d) below, which represent a reasonable interpretation of the survey results? For those that are not reasonable, explain the flaw. D. The interpretativni is llaweu. Te interpretation indicates that the lever of confidence is varying. C. The interpretation is flawed. The interpretation provides no interval about the population proportion. D. The interpretation is flawed. The interpretation suggests that this interval sets the standard for all the other intervals, which is not true. (b) We are 92% to 98% confident 67% of adults in the country during the period of economic uncertainty felt wages paid to workers in industry were too low. Is the interpretation reasonable? A. The interpretation is reasonable. B. The interpretation is flawed. The…
9. A researcher wants to construct a 99% confidence interval for the proportion of Americans who think that the U.S. invading Iraq was an effective step in combating world terrorism. She has no initial idea of what that proportion is. How large should her sample size be if she wants the margin of error to be at most two percent? Show or explain your thinking.
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(b) A sample of 1200 network engineer job applications included 720 are from expatriates. Find the 90% confidence interval of the true proportion of expatriates who applied for the job.
9.

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