5. If the error for estimating µu was within 4 units, how many should we sample at 98% Confidence level to accomplish that if s = 29?
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Q: How large a sample should be selected to provide a 90% confidence interval with a margin of error of…
A: Given,population standard deviation(σ)=60margin of error(E)=9α=1-0.90=0.1α2=0.05Z0.05=1.645
Q: How large a sample should be selected to provide a 95% confidence interval with a margin of error…
A: The formula for the sample size is as follows: Here, zα/2 is the critical value at 95% confidence…
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Q: How large a sample should be selected to provide a 95% confidence interval with a margin of error of…
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Q: QUESTION 9 Calculate the margin of error for an 80% confidence interval for the mean, when the…
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A: Given:Confidence level=95%Sample size (n)=775Sample proportion (p)=0.85Explanation:Significance…
Q: How large a sample should be selected to provide a 95% confidence interval with a margin of error of…
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Q: What sample size is needed to give a margin of error within +6 in estimating a population mean with…
A: Hey, since there are multiple questions posted, we will answer first question. If you want any…
Q: Suppose that the population standard deviation of student scores is 20. What will be the sample size…
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A: The provided information are: Confidence level = 95% = 0.95 So, significance level (alpha) = 1-0.95…
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A: Given: Margin of error (E): E=0.0712 Population variance: σ2=8.85 Confidence level (c) =0.99α=1-c…
Q: How large a sample should be selected to provide a 95% confidence interval with a margin of error of…
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Q: It is desired to obtain a confidence interval for a proportion p of businesses that plan to hire new…
A: Solution: Given information: p = 0.5 Population proportion E= 0.03 Margin of error α=0.10 Level of…
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A: Given information Sample size(n) = 100 Sample mean x̅ =38.5 Sample standard deviation = 3.2…
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Q: How large a sample should be selected to provide a 95% confidence interval with a margin of error of…
A: Given, Margin error (E) = 6 Standard deviation = 20 The objective is to find the sample.…
Q: How large a sample should be selected to provide a 95% confidence interval with a margin of error of…
A: From the provided information, Population standard deviation (σ) = 50 Margin of error (E) = 8…
Q: If a population has standard deviation 20, what is the minimum sample size to be 95% confident that…
A: Solution: From the given information, confidence level is 0.95, σ=20 and E=4.
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Q: The sample size needed to estimate a population mean within 2 units with a 95% confidence when the…
A: Given,σ=8E=2Zc at 95% confidence is Zc=1.96n=?
Q: How large a sample should be selected to provide a 95% confidence interval with a margin of error of…
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Q: How large a sample should be selected to provide a 95% confidence interval with a margin of error…
A: Given: Margin of error (E) = 8 Population standard deviation (σ) = 40 Confidence Interval = 0.95 α =…
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: 1. The mean number of hours of flying time for pilots at Continental Airlines is 49 hours per month…
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Q: 3. Another engineer studies the strength of cables, which has a known population standard deviation…
A: Here we need to obtain the minimum sample size required to obtain a 97% confidence interval.
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Q: How large a sample should be selected to provide a 95% confidence interval with a margin of error of…
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Q: 1. Suppose that 100 samples of water from a fresh water lake are taken and the calcium concentration…
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Q: It is desired to estimate the proportion of cannabis users at a university. What is the sample size…
A: Here, CL=0.95 and E=0.10.
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Q: How large a sample should be selected to provide a 95% confidence interval with a margin of error of…
A: Given dataStandard deviation = 20Confidence interval = 0.95Significance level(α) = 1- 0.95 = 0.05n =…
Q: How large a sample should be selected to provide a 95% confidence interval with a margin of error of…
A: Given information: Confidence interval(c)= 95%. Margin of error(E)=7. Population standard…
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A: Critical value: The confidence level is 100*(1–α)% = 95%. The critical value is obtained as 1.96…
Q: A sample of size 78 produced the sample mean of 16.4. Assuming the population standard deviation…
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- Suppose the scale readings are normally distributed with an unknown mean and standard deviation of =0.01 grams. How large should n be so that a 95% confidence interval for μ has a margin error of 0.0001 or less?Calculate the confidence intervals for 100 mg/L cholesterol at 90% and 95% confidence levels. Supposed that s= 7 is a good estimate of σ.A researcher estimates the 95% CI for a sample with a mean of M = 9.0 and a standard error (sM) of 1.03. What is the confidence interval at this level of confidence?
- A researcher estimates the 95% CI for a sample with a mean of M = 3.26 and a standard error (sM) of 0.91. What is the upper confidence limit for this interval?A doctor wants to estimate the mean HDL cholesterol of all 20 to 29 year old females. How many subjects are needed to estimate the mean HDL cholesterol within 2 points with 99% confidence assuming s=11.2 based on earlier studiess? Suppose the doctor would be content with 90% confidence. How does the decrease in confidence affect the sample size required?the sample size needed to estimate a population mean within 2 units with 95% confidence when the population standard deviation equals 8 is?