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Consider the following random sample from a normal population. Complete parts a and b. 12 18 7 10 9 D. a Click the icon to

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Consider the following random sample from a normal population. Complete parts a and b. 12 18 7 10 9 D. a Click the icon to view a table of lower critical values for the chi-square distribution. a Click the icon to view a table of upper critical values for the chi-square distribution. a. Find the 90% condence interval for the population variance. D

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