A manufacturer bonds a plastic coating to a metal surface. A random sample of nine observations on the thickness of this coating is taken from a week's output and the thickness (in millimeters) of these observations are shown below. Assuming normality, find a 90% confidence interval for the population variance. 19.8 21.7 18.7 20.1 21.6 19.7 19.8 20.7 20.8 Click the icon to view a table of lower critical values for the chi-square distribution. Click the icon to view a table of upper critical values for the chi-square distribution. Find the 90% confidence interval.
A manufacturer bonds a plastic coating to a metal surface. A random sample of nine observations on the thickness of this coating is taken from a week's output and the thickness (in millimeters) of these observations are shown below. Assuming normality, find a 90% confidence interval for the population variance. 19.8 21.7 18.7 20.1 21.6 19.7 19.8 20.7 20.8 Click the icon to view a table of lower critical values for the chi-square distribution. Click the icon to view a table of upper critical values for the chi-square distribution. Find the 90% confidence interval.
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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Transcribed Image Text:Amanufacturer bonds a plastic coating to a metal surface. A random sample of nine observations on the
thickness of this coating is taken from a week's output and the thickness (in millimeters) of these observations
are shown below. Assuming normality, find a 90% confidence interval for the population variance.
19.8
21.7
18.7
20.1
21.6
19.7
19 8
20.7
20.8
Click the icon to view a table of lower critical values for the chi-square distribution.
E Click the icon to view a table of upper critical values for the chi-square distribution.
Find the 90% confidence interval.
1/1
(Round to four decimal places as needed.)
0/1
(0/
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