A manufacturer claims that the average lifetime of its lightbulbs is equal to 36months. A random sample of 64 bulbs has a mean lifetime of 32 months, and thesample standard deviation is 11 months. We will be using a z-test for the populationmean at x = 0.05 to check the manufacturer's claim.The test statistic is:2.9102.12-2.12-2.91

Answered: Image /qna-images/answer/a1939f46-ba6f-41c5-8670-444d6b8088c2.jpg

Answered: A manufacturer claims that the average…

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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A simple random sample of 25 has been collected from a normally distributed population for which it is known the standard deviation is 17. The sample mean has been calculated as 342 and the sample standard deviation of 14.9. Construct a 95% confidential interval for the population mean
According to the World Health Organization, the average height of a one-year-old child is 29". You believe children with a particular disease are smaller than average, so you draw a sample of 20 children with this disease and find a mean height of 27.5" and a sample standard deviation of 1.5". The test statistic is -4.4721 and the p-value is 0.00013 using the calculator function TTEST. If a=0.05, what conclusions can be made? Provide a detailed conclusion including contextualization to the given scenario.
A sample of size 50 will be drawn from a population with mean 76 and standard deviation 14. Find the 69th percentile of x.
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A random sample of 10 subjects have weights with a standard deviation of 11.9848 kg . What is the variance of their weights ? Be sure to include the appropriate units with the result .
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