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(c) How large would the sample need to be so that a 95% confidence interval would have a margin of error of 1.0? The sample size would need to be

(c) How large would the sample need to be so that a 95% confidence interval would have a margin of error of 1.0? The sample size would need to be

MATLAB: An Introduction with Applications
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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Part 3 of 3 (c) How large would the sample need to be so that a 95% confidence interval would have a margin of error of 1.0? The sample size would need to be
Transcribed Image Text:Part 3 of 3 (c) How large would the sample need to be so that a 95% confidence interval would have a margin of error of 1.0? The sample size would need to be
Drill lifetime: A sample of 50 drills had a mean lifetime of 12.05 holes drilled when drilling a low-carbon steel. Assume the population standard deviation is 6.56 . Part 1 of 3 (a) Construct a 95% confidence interval for the mean lifetime of this type of drill. Use tables or technology. Round your answers to at least two decimal places. CD- The confidence interval is Part 2 of 3 (b) The manufacturer of the drills claims that the mean lifetime is greater than 13. Does this confidence interval contradict this claim? (Choose one) ▼ the confidence interval (Choose one) values greater than 13, so the claim (Choose one) ▼ contradicted.
Transcribed Image Text:Drill lifetime: A sample of 50 drills had a mean lifetime of 12.05 holes drilled when drilling a low-carbon steel. Assume the population standard deviation is 6.56 . Part 1 of 3 (a) Construct a 95% confidence interval for the mean lifetime of this type of drill. Use tables or technology. Round your answers to at least two decimal places. CD- The confidence interval is Part 2 of 3 (b) The manufacturer of the drills claims that the mean lifetime is greater than 13. Does this confidence interval contradict this claim? (Choose one) ▼ the confidence interval (Choose one) values greater than 13, so the claim (Choose one) ▼ contradicted.
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