A manufacturer of Li-based batteries claims that their newly designedbatteries will last, on average, 5 years with a standard deviation of 1 year.A random sample of 9 of these batteries was tested and found to havethe following expected lifetimes in years: 4.0, 3.0, 6.8, 7.9. 6.0, 3.7, 3.4.4.6, 5.7Determine the 95 % confidence interval of standard deviation (variability)of the battery life.O(0.8, 2.1)O (3.8, 6.2)O (1.1, 3.2)O (1.1. 3.2)

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Answered: A manufacturer of Li-based batteries…

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 sample of 30 randomly selected patients in a waiting room at a doctor’s office reported a mean wait time of 38.5 minutes. If the population standard deviation is 1.78 minutes, find a 95% confidence interval for the population mean wait time.
In order to investigate the relationship between mean job tenure in years among workers who have a bachelor s degree or higher and those who do not, random samples of each type of worker were taken. Sample 1 had mean value of 8.2, standard deviation of 1.3 and a sample size of 155. Sample 2 had mean value of 7.0, standard deviation of 1.5 and a sample size of 210. Construct the 90% confidence interval for the difference in the population means based on these data. "0.9506 to 1,4493" 0.9506 to 1.5593 0.8756 to 1.4493 0.1234 to 0.4321 0.7506 to 1.4493 correct option?
In a test of the effectiveness of garlic for lowering cholesterol, 48 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 5.5 and a standard deviation of 19.8. Construct a 99% 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? Click here to view at distribution table. Click here to view page 1 of the standard normal distribution table, Click here to view page 2 of the standard normal distribution table. What is the confidence interval estimate of the population mean u? O mg/dL < µ
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