Data taken over a long period of time have established that the standard deviation ofpercentage iron in an iron analysis is 0.12, and that is not expected to change. Arepresentative, well-mixed ore sample is analyzed six times, so the sample size is 6.If the true iron content is 32.60 percent iron, if there is no systematic error, and if thenormal distribution applies, what is the 95% confidence interval for sample means?

Answered: Image /qna-images/answer/24bc0b44-65c7-439c-9213-c3d5c2be6c13.jpg

Answered: Data taken over a long period of time…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Find the critical value for a 94% confidence interval when the sample size is 51 and the population standard deviation is known.
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10 In a test of the effectiveness of garlic for lowering cholesterol, 44 subjects were treated with garlic in a processed tablet form. Cholesterol levels were measured before and after the treatment. The changes (before−after) in their levels of LDL cholesterol (in mg/dL) have a mean of 3.4 and a standard deviation of 18.8. Construct a 95% confidence interval estimate of the mean net change in LDL cholesterol after the garlic treatment. What does the confidence interval suggest about the effectiveness of garlic in reducing LDL cholesterol? What is the confidence interval estimate of the population mean μ? (?) mg/dL<μ<(?) mg/dL (Round to two decimal places as needed.) What does the confidence interval suggest about the effectiveness of the treatment? A. The confidence interval limits contain 0, suggesting that the garlic treatment did not affect the LDL cholesterol levels. B. The confidence interval limits do not contain 0, suggesting…
What is the minimum required sample size to make a 96% confidence interval for a population mean if the margin of error is to be 2 inches and the standard deviation is thought to be about 12 inches?
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