Which of the following best represents the appropriate sample size to use when estimating an unknown population mean within 3 units, with 80% confidence if an estimate of the population standard deviation is 12? 44 62 27

Q: A population has mean µ = 40 and %3D standard deviation o = 20. What should %3D the sample sizen be…

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Q: Assume that a sample is used to estimate a population mean. Find the margin of error M.E that…

A: From the given information we find the margin of Error.

Q: The population mean is 75 and the population standard deviation = 6. Random samples (containing 16…

A: Given , The population mean ( n )   = 75 ,  the population standard deviation ( σ )= 6

Q: The population has a mean of 14 and a standard deviation of 3. The sample size of your sampling…

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Q: A statistician uses Chebyshev's Theorem to estimate that at least 90 % of a population lies between…

A: We have to find correct answer for given data..

Q: Test the claim that a population mean equals 450. The obtained sample mean from the sample of 280…

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Q: A population has a stand. dev. of 24. on average, how much difference should there be between the…

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Q: Assume that a sample is used to test a normal population mean(μ). A sample of size 33 with a mean of…

A: Answer: From the given data, Sample size(n) = 33 mean (X¯) = 26.2 Standard deviation (S) = 5.4 μ =…

Q: Construct a 99%cofidence interval for a population mean if we have a sample mean of 67.5 a sample…

A: x = 67.5S= 8.3n = 799% CI for μ=?

Q: You need to estimate the mean number of travel days per year for sales people. The mean of a small…

A: Given that : Standard deviation σ = 12 days Margin of error (E)= 3 We have to find 80% confidence…

Q: You want to create a Z-interval for a population mean, using table C, with the following…

A: From the provided information, Sample size (n) = 25 Mean (x̅) = 34.2 Population standard deviation…

Q: You have a sample mean of 11, a population average of 17, and a standard error of the mean of 3.…

A: Givensample Mean(x)=11population average(μ)=17standard error(SE)=3

Q: Provide an appropriate response. Determine the sample size required to estimate the mean score on a…

A: Solution: From the given information, confidence level is 0.90, S=15 and E=4.

Q: We need to have an SRS from the target population. ) All of the answer options are correct. We need…

A: The one sample z-test is a statistical technique that used to define whether a sample of data could…

Q: ith a mean of 110 and standard dev. of 15, find the 3 unique deviations to the left and right of the…

A: Deviations to the left   i) One standard deviation away from mean x = u - s x = 110 - 15 = 95   ii)…

Q: We want to obtain a sample to estimate a population mean. Based on previous evidence, researchers…

A: The sample size must be equal to 9375.Explanation:Step 1: List the given values as provided in the…

Q: For a sample with a mean if M=63, a score of X=54 corresponds to Z= -0.75. what is the sample…

A: Given,Mean(M)=63a raw score(X)=54Z-score=-0.75

Q: For a random sample of 55 overweight men, the mean of the number of pounds that they were overweight…

A: Answer: From the given data, Sample size (n) = 55 Sample mean x¯ = 31 pounds Population standard…

Q: 99% confidence interval for the mean of entire student.

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Q: The 0 in the numerator for the formula for the paired samples + test statistic represents the _____…

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Q: A statistics practitioner took a random sample of 54 observations from a population whose standard…

A: Given,sample size(n)=54sample mean(x¯)=109population standard deviation(σ)=32

Q: The mean number of travel days per year for salespeople employed by three hardware distributors…

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Q: SHS Principal wishes to estimate the average number of hours that Grade 11 students study each week.…

A: Given that  Population standard deviation =2.6 Margin of error =E =0.5 99% confidence.

Q: Determine the sample size required to estimate the mean score on a standardized test within 2 points…

A: Given,margin of error(E)=2standard deviation(s)=15α=1-0.98=0.02α2=0.01Z0.01=2.33      (from Z-table)

Q: A simple random sample of 100 observations was taken from a large population. The sample mean and…

A: Givensample size(n)=100Mean(x)=81standard deviation(s)=9

Q: we want to obtain a sample to estimate a population mean. Based on previous evidence, researchers…

A: Given that, Critical value: Using the z-table, the critical value at 99% confidence level is,

Q: Calculate the observed z value using a sample mean of 25, a population average of 20, and a standard…

A: Given data: Sample mean = 25 Population  average = 20 Standard error of the mean  = 8

Q: The average number of days spent on the road for business by business travellers is 115 per year.…

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Q: The population has a mean of 120 and a standard deviation of 12. The sample size of your sampling…

A: Given: Population standard deviation σ=12 Sample size (N) = 16

Q: P3. Show that the mle of unknown standard deviation when the mean is known is different from the…

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Q: A researcher wants to estimate the mean income of all physicians in a city at a 95% confidence…

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