A research engineer for a tire manufacturer is investigating tire life for a new rubbercompound and has built 16 tires and tested them to end-of-life in a road test. The samplemean and standard deviation are 60,139.7 and 3645.94 kilometers. What is the 95%confidence interval for the population mean? (round off to nearest hundreds)O (58500,61800)O (58200,62100)O (58400,61900)O None of the ChoicesO (58300,62000) Our research group is developing a chemically treated natural fiber for its tensile strengthproperties. Thirty pieces were tested under similar conditions and the results showed anaverage tensile strength of 500.05 MPa and a standard deviation of 80.55 MPa. Assumethat the sample standard deviation represents population standard deviation. What is thelower bound of the tensile strength (in MPa) at a one-sided 99% confidence level?O 446.3O 469.60O 462.17O 465.8

GivenMean(x)=60139.7standard deviation(s)=3645.94sample size(n)=16c=95%

Answered: A research engineer for a tire…

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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Noise Levels in Hospitals In a hospital study, it was found that the standard deviation of the sound levels from 25 areas designated as "casualty doors" was 6.0 dBA and the standard deviation of 21 areas designated as operating theaters was 3.7= dBA. At a0.05, can you substantiate the claim that there is a difference in the standard deviations? Use σ1 for the standard deviation of the sound levels from areas designated as "casualty doors." (a)State the hypotheses and identify the claim. H0: H1: This hypothesis test is a one tailed/two-tailed test. (b)Find the critical value. Round the answer to two decimal places. Critical value= (c)Compute the test value. Round the F score value to two decimal places as needed. F= (d)Make the decision. Reject/do not rejecct the null hypothesis. (e)Summarize the results. There is/is not enough evidence to support the claim that there is/is not a difference in the standard deviations of the sound levels.
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