Amanufacturer bonds a plastic coating to a metal surface A random sample of nine observations on the thickness of this coating from a week's op and the time in italian nommity, find a 90% confidence interval for the population varianos 197 21.5 205 214 196 137 202 207 Click the icon to view table of lower critical values for the chi-sour distribution Click the icon to view a table of upper riscal values for the chi-square datebution 114 Find the box confidence interval (Round to two decimal places as needed)