A research scholar wants to know how many times per hour a certain strand of virus reproduces. He wants to construct the 80 % confidence interval with a maximum error of 0.17 reproductions per hour. Assuming that the mean is 12.7 reproductions and the variance is known to be 3.61. what is the minimum sample size required for the estimate? Round your answer up to the next integer.

Q: An economist wants to estimate the mean per capita income (in thousands of dollars) for a major city…

A: Given information:Mean income(μ) = $22.2 (in thousands of dollars)Variance (σ 2)= $136.89Standard…

Q: An economist wants to estimate the mean per capita income (in thousands of dollars) for a major city…

A: The population mean per capita income for a major city in State C is .It is needed to find the…

Q: An IQ test is designed so that the mean is 100 and the standard deviation is 16 for the population…

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Q: A sample of 25 bottles of orange juice were measured and the sample standard deviation is 1.8…

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Q: An Army official wants to estimate the mean weight of a particular type of weapon.  He takes a…

A: Given that, Mean = 48.1 Standard deviation = 0.12 Sample size = 100 98% confidence level

Q: You want to estimate the mean time college students spend watching online videos each day.  The…

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Q: Suppose that you wish to find a population proportion p with accuracy ±2% with 99% confidence. What…

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Q: n Find the size of the sample needed to estimate the difference between the proportions of Democrats…

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Q: A study of life expectancy showed that a random sample of 6 states had a standard deviation of 1.4…

A: Obtain the 98% confidence interval for the population variance. The 98% confidence interval for the…

Q: Dylan wants to determine a 95% confidence interval for the true proportion of high school students…

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Q: Canadians usually spent around $940 on Christmas presents in 2005. Assume the standard deviation is…

A: Given: Mean=μ=940 and standard deviation=σ=210. Sample size=n=70.

Q: Assume thAt scores on a standardized test are known to follow a bell shaped distribution with a mean…

A: L

Q: A psychologist wants to estimate the variance of scores obtained by employees on a test. A random…

A: Confidence interval:A confidence interval shows the probability that a parameter will fall between a…

Q: A research company desires to know the mean consumption of meat per week among people over age 32.…

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Q: In a random sample of nine people, the mean driving distance to work was 25 miles the sample…

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Q: The population mean of a set of data is unknown. The sample mean is 44, and the error bound for the…

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Q: In a random sample of 15 ​people, the mean driving distance to work was 18.5 miles and the standard…

A:

Q: Determine the sample size for a on-line survey with a variability of 30% and a 95% confidence…

A: Sample size n=z2(p*q)/e2

Q: Suppose you want to construct a confidence interval with a margin of error of 0.03 (3%). Find the…

A: The formula for calculating sample size is, n = z2*p^(1-p^)MOE2 Where, z is the z score (default…

Q: Find the 97% confidence interval for the variance and standard deviation for the time it takes a…

A: In question, We'll find the 97% confidence interval for the variance and standard deviation for the…

Q: An IQ test is designed so that the mean is 100 and the standard deviation is 17 for the population…

A: For the distribution of IQ scores for normal adults at the population level, it is given that:…

Q: how large of a sample is required to estimate the mean usage of electricity? Round your answer up to…

A: Given, Margin of Error (ME) =0.1Variance =σ2=4Mean = μ = 19.6

Q: During rush hour, the traffic speed on a busy highway is found to have mean 42 mph and standard…

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Q: A researcher wants to make a ninety-five percent confidence interval for the population mean. She…

A: From the given information,Margin of error , E = 0.56 Population variance, 7.6 Using formula ,

Q: It is known that the population variance equals 484. With a .95 probability, the sample size that…

A: The given population variance, σ2=484.For the specified probability of 0.95, the associated…

Q: Assume that population mean is to be estimated from the sample described. Use the sample results to…

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Q: A statistics practitioner took a random sample of 55 observations from a population whose standard…

A: It is given that, Sample mean = 104. Population standard deviation, sigma is 31. The sample size, n…

Q: If the standard deviation of a variable is 4​, what is the​ variance?   ​(This is a reading…

A: Given information: The standard deviation of the variable is 4.

Q: Assume that a sample is being used to estimate a population mean μμ. If n = 29, x¯ = 46, and s =…

A: From the provided information, Sample size (n) = 29 Sample mean (x̅) = 46 Sample standard deviation…

Q: If X= 102, o=9, and n=63, construct a 95% confidence interval estimate of the population mean, μ.

A: Formula to constructing the confidence interval about mean , when the population standard deviation…

Q: Assume that you want to construct a​ 95% confidence interval estimate of a population mean. Find an…

A: 95% CI  for μE=3.4S=55.3n=?For 95% CI,  P(-z<μ<z)=0.95  ∴z=1.96       ∵z table

Q: A medical researcher surveyed 9 hospitals and found that the standard deviation for the cost for…

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Q: average family the variance is 5.29 kW and the mean is 19.9 kW per day. If they are using 80% level…

A: Given : Margin of error, ME = 0.14 population standard deviation, σ = √5.29…

Q: Your state is considering raising the legal age for consumption of alcoholic beverages to 21 years…

A: p = 0.5 Margin of error = 0.01

Q: Assume that a sample is being used to estimate a population mean μμ. If n = 19, x¯ = 43, and s = 3,…

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Q: Suppose you survey a random sample from a large population to understand the population proportion.…

A: Obtain the sample size of a no preliminary estimate for p. The formula of sample size is, Obtain…

Q: A marketing research company desires to know the mean consumption of milk per week among people over…

A: Given data: Sample mean  = 4.6 liters Margin of error  = 0.08 liters Confidence level = 90%…

Q: Assume that you took a sample and calculated the sample mean as 100.you then calculated the lower…

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Q: Assume that a sample is used to estimate a population proportion p. To find the 95% confidence…

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Q: f n=300 and x=60, construct a 99% confidence interval estimate for the population proportion.

A: n=300 and x=60, construct a 99% confidence interval

Q: An economist wants to estimate the mean per capita income (in thousands of dollars) for a major city…

A:

Q: Suppose we want a 99% confidence interval for the average amount spent on books by freshmen in their…

A: Standard Deviation = σ = 31 Margin of Error = E = 3 Confidence Level = 99 Significance Level =…

Q: II. Consider the data from two samples displayed in the two histograms: Sample A Sample B 30 30 25…

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