[Solved] 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
Question: 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 the week’s output and the thickness (in millimeters) of each observation is as follows:
19.8 21.2 18.6 20.4 21.6 19.8 19.9 20.3 20.8
Assuming normality if necessary, find a 90% confidence interval for the population variance.
Deliverable: Word Document 
Solution: A random sample of six salespersons that attended a
![[All Steps] Students in an introductory economics](/images/solutions/MC-solution-library-44313.jpg "[All Steps] Students in an introductory economics class are assigned")
[All Steps] Students in an introductory economics class are assigned
(Solution Library) A group of 100 students registered in a Calculus
![[Solution Library] From a random sample of](/images/solutions/MC-solution-library-44315.jpg "[Solution Library] From a random sample of six students in an")
[Solution Library] From a random sample of six students in an
![[See Solution] In a random sample of](/images/solutions/MC-solution-library-44316.jpg "[See Solution] In a random sample of 120 large retailers, 85 used")
[See Solution] In a random sample of 120 large retailers, 85 used
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