Drill lifetime: A sample of 50 drills had a mean lifetime of 12.88 holes drilled when drilling a low-carbon steel. Assume the population standard deviation is6.31.Part: 0/3Part 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 decimalplaces.The confidence interval is11.1314.63Part: 1/ 3Part 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)v values greater than 13, so the claim (Choose one) ▼contradicted.NOV20MacBook AirDD888F11F7F8F9F10F6

Given : 95% confidence interval is 11.13 <u<14.63

Answered: Drill lifetime: A sample of 50 drills…

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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Create a 85% confidence interval for a population mean from a sample of size 46 with sample mean i = 4.5. The population standard deviation is known to be o = 0.77. [three decimal accuracy] [three decimal accuracy]
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