A telephone poll of 850 American adults asked "where would you rather go in your spare time? one response by 255 adults was " the mall".  Compute and explain a 98% confidence interval estimate of the porporation of all American adults who would respond "the mall".

Q: Which is larger (for a 95% confidence interval): the t-stat or the z-stat?

A: The Z critical value for 95% confidence interval is 1.96. The t critical value for 95% confidence…

Q: During a flu vaccine shortage in the United States, less than a majority of people were able to…

A: Given data, n=2350 x=978 sample proportion p=xn=9782350=0.4162   z-value at 95% confidence is…

Q: In a poll conducted by the Gallup organization in April 2013, 48% of a random sample of 1022 adults…

A: Obtain the 95% confidence interval for the proportion of all U.S. adults in April 2013 who felt that…

Q: In a recent poll, 410 people were asked if they liked dogs, and 24% said they did. Find the Margin…

A: We have to find margin of error.

Q: In a survey of 2113 adults in a recent​ year, 741 made a New​ Year's resolution to eat healthier.…

A:

Q: In a simple random sample of 38 bulbs, 25 gives a good glow, What is a 85% score Confidence interval…

A: Given data,n=38x=25sample proportion p=xn=2538=0.66z-value at 85% confidence is Zc=1.44

Q: In a recent poll, 280 people were asked if they liked dogs, and 51% said they did. Find the margin…

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Q: In a recent poll, 340 people were asked if they liked dogs, and 31% said they did. Find the margin…

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Q: When Mendel conducted his famous genetics experiments with peas, one sample of offspring consisted…

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Q: In a recent poll, 500 people were asked if they liked dogs, and 92% said they did. Find the margin…

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Q: In a recent poll, 260 people were asked if they liked dogs, and 13% said they did. Find the margin…

A:

Q: A magazine reports survey results of 600 randomly selected adults bystating that: “65% of those…

A: From the given information, Sample size (n) = 600 Probability that favor gun control (p) =0.65…

Q: In a recent poll, 480 people were asked if they liked dogs, and 52% said they did. Find the margin…

A: Provided, N=480 P=0.52 be the proportion of people who liked dogs. a=0.10

Q: The Pew Forum on Religion and Public Life reported on Dec. 9, 2009, that in a survey of 2003…

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Q: In a recent survey of 200 households, 172 had central air conditioning.  Find the 85% confidence…

A: Given that In a recent survey of 200 households, 172 had central air conditioning That is…

Q: 11) In a Gallup poll, 1011 adults were asked if they consume alcoholic beverages and 64% of them…

A: (11) Obtain the 90% confidence interval estimate of the proportion of all adults who consume…

Q: A Gallup poll of 1001 Americans age 18 and over conducted in May of 2013 found that 80% of the…

A: Solution: From the given information, p-hat=80% and the margin of error is 3.2%.

Q: In a recent poll, 120 people were asked if they liked dogs, and 29% said they did. Find the margin…

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Q: In a recent poll of 1100 randomly selected adult bicyclists , 26% said they regularly ride their…

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Q: Are boys more likely? A random sample of 24,468 records of newborn first born children revealed the…

A: Solution:Point estimate: The population parameter which is estimated by using sample statistic is…

Q: In a sample of 40 water specimens taken from a construction site 26 contained detectable level of…

A: According to the provided information, sample size (N)=40 number of favorable cases (X) = 26 The…

Q: The Pew Forum on Religion and Public Life reported on Dec. 9, 2009, that in a survey of 2003…

A: Given : Sample size(n)=2003sample proportion(p^)=0.25confidence level (c)=0.99α=1-c   =1-0.99…

Q: A survey of 52 students in grades 4 through 12 found 65% have classroom Wi-Fi access. Find the 90%…

A: We have given that,  Sample size (n) = 52 and sample proportion (p̂) = 65% = 0.65  Then,  We will…

Q: In 2017, the CDC administered the Youth Risk Behavior Survey (YRBS) to a random sample of 14,795…

A: We have given that,  Favorable cases (X) = 2219 and sample size   (n) = 14795. Then,  We will find…

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: A sample of 800 parents, 632 of whom believe that music education has a positive effect on academic…

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Q: In a survey, 19 people were asked how much they spent on their child's last birthday gift. The…

A: From the provided information, Sample size (n) = 19 Sample mean (x̄) = $46 Sample standard deviation…

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 recent poll, 260 people were asked if they liked dogs, and 32% said they did. Find the margin…

A: Find z-critical value:…

Q: In a survey of 2025 adults in a recent year, 711 made a New Year's resolution to eat healthier.…

A: Given: n=2025x=711α=0.10

Q: In a recent poll, 170 people were asked if they liked dogs, and 24% said they did. Find the margin…

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Q: In a 2012 survey, Gallup asked a random sample of U.S. adults if they would prefer to have a job…

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Q: We plan to sample parents in order to construct a 99% confidence interval for the proportion who…

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Q: A study was being done to estimate the proportion of students who receive financial aid. If the…

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Q: A Pew Research Center survey of 1,857 internet users found that 1,124 people agreed that online…

A: Given: CI=95% p^=11241875=0.599 n=1875

Q: ) In a Gallup poll, 1011 adults were asked if they consume alcoholic beverages and 64% of them said…

A: 11. Given information: The sample size is 1011 adults. 64% of them said that they did. That is,…

Q: Your analysis of the raw data indicates that 16 of the 30 students reported driving no more than 20…

A: From the given information, let X be the number of students reported no more than 20 miles per day.…

Q: In June 2020, a Gallup Poll asked U.S. adults whether immigration was a good thing or a bad thing…

A: Given : n = 1000 X = 600

Q: In a recent poll, 150 people were asked if they liked olives, and 23% said they did. Find the margin…

A: Given: n=150 p=0.23 α=0.1

Q: Many people think that a national lobby's successful fight against gun control legislation is…

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Q: A marketing study with a random sample of 400 results in 160 subjects reacting positively to the…

A:

Q: An online site presented this​ question, "Would the recent norovirus outbreak deter you from taking…

A: From the provided information, Sample size (n) = 34006 Proportion of people who responded “yes” to…

Q: In a survey of 2024 adults in a recent​ year, 709 made a New​ Year's resolution to eat healthier.…

A:

Q: In a recent poll, 100 people were asked if they liked dogs, and 90% said they did. Find the margin…

A: Obtain the margin of error at the 95% confidence level. The margin of error is obtained below as…

Q: The Associated Press (October 9, 2002) reported that in a survey of 4722 American youngsters aged 6…

A: Obtain the 99% confidence level for the proportion of all American youngsters who are seriously…

Q: In a recent poll, 480 people were asked if they liked dogs, and 44% said they did. Find the margin…

A: Given: Sample size, n =480 p^=44%=0.44 Confidence interval = 90% At 90% C.I:…

Q: In a study designed to determine whether there was a cluster of brain cancer cases at a Pratt &…

A: The formula for the 95% confidence interval for the proportion is It is given that record from…

Q: In a survey of 2033 adults in a recent​ year, 735 made a New​ Year's resolution to eat healthier.…

A: First find out the true population proportion .    Total number of adults in a survey = n= 2033…

Q: In a recent poll, 240 people were asked if they liked dogs, and 47% said they did. Find the margin…

A: Obtain the margin of error at the 90% confidence level. The margin of error at the 90% confidence…

Q: In a trial of 275 patients who received 10-mg doses of a drug daily, 44 reported headache as a side…

A: The known values are, The sample proportion is,

2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.