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 thicknesses (in millimeters) of these observations are as follows:19.8  21.2  18.6  20.4  21.6  19.8  19.9  20.3  20.8Assuming normality, find a 90% confidence interval for the population variance.

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