例题3: Based on a survey of a random sample of 900 adults in the United States, a journalist reports that 60 percent of adults in the United States are in favor of increasing the minimum hourly wage. If the reported percent has a margin of error of 2.7 percentage points, which of the following is closest to the level of confidence? (A) 80.0% (B) 90.0% (C) 95.0% (D) 95.5% (E) 99.0%

Q: In a telephone survey of 1100 adults, 740 adults expressed concern about the future health of social…

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Q: In a recent poll, 370 people were asked if they liked dogs, and 69% said they did. Find the Margin…

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Q: In a recent poll, 260 people were asked if they liked dogs, and 9% said they did. Find the margin of…

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Q: When you construct a 95% confidence interval, what are you 95% confident about?

A: Confidence intervals: Confidence intervals are the limits for the point estimate of population…

Q: What is the purpose of finding a confidence interval for a proportion?

A: A true (or population) proportion (denoted as p), by definition, is essentially determined as the…

Q: In a recent poll, 270 people were asked if they liked dogs, and 15% said they did. Find the Margin…

A: given data sample size (n) = 270p^ = 0.1595% ci p, E = ?

Q: In a recent poll, 300 people were asked if they liked dogs, and 89% said they did. Find the margin…

A: Solution: From the given information, p-hat=0.89 and n=300.

Q: Find the Margin of Error for this poll, at the 95% confidence level.

A: It is given that in a recent poll, 210 people were asked if they liked dogs, and 36% said they did.…

Q: Out of 240 sample students surveyed, 187 students are planning to take classes during the…

A: We have given that the sample size n=240 and favourable cases X=187. Sample proportion p^ = X/n.

Q: The internal auditing staff of a local manufacturing company performs a sample audit each quarter to…

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Q: Suppose in a recent poll of 1250 randomly selected Californians who took vacations, 132 of them…

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Q: UCLA would like to conduct a study to estimate the proportion of all UCLA students attending…

A: The value of margin of error is, Critical values: Using the z-table, the critical value at 98%…

Q: A recent survey asked the question, “Have you ever cut off communication with a family member…

A: Given that, p^=0.17,n=5592 Critical values: By using the standard normal table of Z, the critical…

Q: Suppose we observed 120 successes in a random sample of 300 subjects. What is the 98% confidence…

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Q: Suppose you calculate a 99% confidence interval to be: 13.05 to 20.75. Determine the margin of error

A: Given data: The given upper limit is b=20.75. The given lower limit is a=13.05.   The expression for…

Q: You plan to construct a 90% confidence interval for the proportion of all middle school students who…

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Q: d their candidate. State your answers as percents rounded to 1 decim

A: Here it is given that -  Of the 619 randomly selected likely voters surveyed, 305 supported their…

Q: A survey asked, "How important is it to you to buy products that are made in America?" Of the 600…

A: Given x=450 n=600

Q: 99% confidence interval for the proportion of the high school students who have been cyberbullied,…

A: Given that Sample size n = 14795 Number of high school students who have cyberbullied, X = 2219 The…

Q: b. In the year 2000, a survey of 977 U.S. adults were asked who they felt was the greatest…

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Q: A company wants to know what proportion of their customers plan to repurchase their product in the…

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Q: In a recent poll, 130 people were asked if they liked dogs, and 24% said they did. Find the margin…

A: Given, Total number of people = 130 Probability that a person likes a dog = 0.24 z value at 99%…

Q: In a​ poll, 6969​% of the people polled answered yes to the question​ "Are you in favor of the death…

A: Obtain the value of the minimum number of surveyed people. The value of the minimum number of…

Q: In a study, 68% of 900 randomly selected adults said they believe the Republicans favor the rich. If…

A: Given that, P⏞=68%=0.681-P⏞=1-0.68=0.32n=900E=2%=0.02 Now,…

Q: A television sports commentator wants to estimate the proportion of citizens who​ "follow…

A: Solution: From the given information, confidence level is 0.96 and E=0.02.

Q: The analyst decides to test this assumption by collecting a random sample of 100 New Yorkers and…

A: The sample proportion is, p^=xn=65100=0.65 Computation of critical value:…

Q: 1. A poll of 2,500 people shows that 50% approve of a smoking ban in bars and restaurants. What is…

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Q: In a recent poll, 300 people were asked if they liked dogs, and 71% said they did. Find the Margin…

A:

Q: In a recent polI, 200 people were asked if they liked dogs, and 15% said they did. Find the margin…

A: From the provided information, Sample size (n) = 200 15% people said they like dogs that is p̂ =…

Q: Convert answers to percents and round to 2 decimal places. Example: 0.387582 is 38.76% 23. A simple…

A: Given Information: Sample size n=1825 Out of which x=1304 people said that they support the tax.…

Q: in a recent poll, 220 people were asked if they liked dogs, and 36% said they did . find the margin…

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Q: In a recent poll, 289 people were asked if they liked dogs, and 17% said they did. Find the margin…

A: Let X be the number of people who liked dogs Given: Number of people or sample size (n) = 289…

Q: In a previous election, the confidence interval for the proportion of likely voters who would vote…

A: given;confidence interval for the proportion;(0.4401, 0.5199)i.e. (p^-E, p^+E)where  p^ : point…

Q: A newspaper reported the results of a political poll about which candidate likely voters preferred,…

A: Introduction: The 100 (1 – α) % confidence interval for the population proportion, p is: The margin…

Q: An investigative reporter contacts a random sample of hotels, and finds a 95% confidence interval…

A: Given that  The 95% confidence interval for the proportion of hotels in the united states have…

Q: What does the 95% represent in a 95% confidence interval

A: Solution CI=95%

Q: The Nellie Mae organization conducts an extensive annual study of credit card usage by college…

A:

Q: a magazine provided results from a poll of 2000 adults who were asked to identify their favorite…

A: Given Information: A magazine provided results from a poll of 2000 adults who were asked to identify…

Q: What would answer be at 99% confidence interval?

A: We have given that,  Sample proportion (p̂) = 64% = 0.64 and sample size (n) = 550 Then,  We will…

Q: You are conducting a study to estimate the mean height of students in a university. The university…

A: To calculate the sample size required to estimate the mean height of students in the university with…

Q: In a recent poll, 190 people were asked if they liked dogs, and 81% said they did. Find the Margin…

A:

Q: A  proportion confidence interval problem resulted in the following interval as the answer:  (…

A: We have to find margin of error..