A firm having 4000 employees took a random sample of 25 in order to estimate their average annual state tax payment with 99% confidence. If the results were  x̅ = $640 and s = $20, what is the best interval estimation

Q: ung people are driving. In 1983, 87% of 19-year-olds had a driver’s license. Twentyfive years later…

A: (a) Given: Sample Proportion \hat pp^​ = 0.870.87 NN = 12001200 The critical value for…

Q: Find the critical value for the population mean if there are 756 cats in a sample and you want a 91%…

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Q: A survey found that 73% of a random sample of 8344 American adults approved of cloning endangering…

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Q: A researcher found a 95% confidence interval for the proportion of college students who believe in…

A:

Q: The blue catfish (Ictalurus Furcatus) is the largest species of North Amercian catfish. The current…

A: Note- As per our policy we can answer only the first 3 sub-parts of a question. If you want…

Q: A DNP student wants to evaluate the change in knowledge scores of a group of cardiac patients after…

A: In given problem, a DNP student obtains a pretest at the beginning of class and immediately after…

Q: A poll of n = 500 randomly selected elementary school students resulted in 110 of them stating…

A:

Q: Sales team of a New Ventures Company is in the process of introducing a new product. As an initial…

A: We want to find the sample size.

Q: Dr. Samwell Tarly wants to estimate the number of books checked out of the library in the past year.…

A: It is given that the mean is 10,000 and the standard deviation is 10.

Q: survey to determine if the percentage of adults who use social media has changed from 52%, which was…

A: The sample proportion is computed as follows, The critical value for 96% confidence level, i.e.,…

Q: A Seattle consumer agency believes that plumbers’ rates are too high and wants to estimate the mean…

A: GivenConfidence Interval(c)=95%Margin of Error(E)=3%=0.03Let…

Q: 7. Create a confidence interval for o using the following information: Ages of people driving in the…

A:

Q: Facing the threat of unemployment rates reaching a new high, the Australian government decided to…

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Q: In a study conducted to examine criminal behavior in society, 800 questionnaires were conducted. 6%…

A:

Q: A poll of 1468 U.S. adults found that 44% regularly used Facebook as a news source. Find the…

A: Given information Sample size (n) = 1468

Q: A federal report indicated that 17% of children under age 6 live in poverty in Nevada, an increase…

A: Given data, p=17%=0.17 E=2%=0.02 z-value at 99% confidence is Zc=2.576 n=?

Q: How may we enhance confidence in a point estimate?

A: We know that, if the sample size (n) tends to infinity then sample statistic tends to population…

Q: T.J. wants to estimate the percentage of college students who have taken out student loans. He…

A:

Q: 6. to the nearest percentage point, the margin of error for this survey is?

A: Given: Lower limit = 0.74 Upper limit = 0.86 The point estimate can be calculated as: Point estimate…

Q: in a poll taken in december of 2012, gallup asked 1006 u.s adults wheter they were baseball fans.…

A: Solution : Given : n= 1006             p = 0.40          ( For December 2012 )             p = 0.35…

Q: magine that you conduct a study and estimate that the prevalence of hypertension among employees of…

A: It is given that the estimated prevalence is 24%.

Q: A study at Harvard found that 44% of their students binge drink. You are at Princeton doing a…

A:

Q: A hospital administrator wants to estimate the proportion of patients whose hospital stay exceeds a…

A: Given Margin of error=0.06 P-cap=0.5

Q: You recently sent out a survey to determine if the percentage of adults who use social media has…

A: It is given that sample size (n) is 2,953 and the number of respondents stated that they currently…

Q: By means of a pilot survey, it is already known that the proportion of residents in opposition to…

A: Formula for sample size is,

Q: Jane wants to estimate the proportion of students on her campus who eat cauliflower. After surveying…

A: Solution: Given that, Estimate the proportion of students on her campus who eat cauliflower n=20 #…

Q: When 290 college students are randomly surveyed, it is found that 120 own a car. Find a 99%…

A: Given that, x=120,n=290 The sample proportion is, Critical values: By using the standard normal…

Q: An epidemiologist wants to estimate the proportion of residents in her city that carry the Hepatatis…

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Q: A recent study indicated that 24% of women over 55 are widows. A researcher wishes to estimate with…

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Q: Ethan is surveying students who are interested in watching television (TV) shows. Ethan has surveyed…

A:

Q: A sample of 175 U.S. adults is composed of 100 women and 75 men. What is the estimate of the true…

A: Given problem Given that

Q: lution is incorrect since the  confidence level is 90% margin of error is 3%

A: Given: Confidence level = 0.90 Margin of error (E) = 0.03 Assumed sample proportion  p^     = 0.50

Q: Nearly one-half of Filipinos aged 25 to 29 are unmarried. How large a sample is necessary to…

A:

Q: We are interested in estimating the proportion of employees of a very large corporation who prefer…

A: Solution: From the given information, confidence level is 0.95 and E=0.03.

Q: A pollster wishes to estimate the number of left-handed scientists. How large a sample is needed in…

A: It is given that margin of error (E) is 0.04 and the confidence level is 0.95.

Q: In 2011 the U.S. Department of Transportation reported with 95% confidence that the average length…

A: We have to find confidence interval value.....

Q: Most adults would erase their personal data from the internet if they could. A software firm survey…

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Q: Find 95% confidence interval for the population mean, if the sample size is 40, the sample mean is…

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Q: The proportion of junior executives leaving large manufacturing companies within three years is to…

A:

Q: Express the form of most of the confidence intervals that you will encounter in your study of…

A: Confidence Interval:Confidence interval is the interval estimate of the population parameter. It is…

Q: If a 90%, a 95% and a 99% confidence interval are foung for a population mean, describe how the 3…

A: Population mean CI for known population standard deviation is, CI=x¯±Zσnwhere,σ=population standard…

Q: Out of 500 people sampled, 145 received flu vaccinations this year. Based on this, construct a 90%…

A: We have given that  Sample size n=500 , favorable cases x=145 90% confidence interval  Sample…

Q: Nearly one-half of Americans ages 25 to 29 are unmarried. How large a sample is necessary to…

A: The provided information is The margin of error is E=0.02 α=0.05 The critical value is zc=1.96…

Q: Suppose we measure GPA for people in our class, we find the mean is 2.8 and the median is 3.2. What…

A: Given: Mean = 2.8 Median = 3.2

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.