that r 19-24. It is known that the mean diameters of rivets produced by two firms A and B are practically the same but the standard deviations may differ. For 22 rivets produced by firm A, the standard deviation is 2-9 mm. while for 16 rivets manufactured by firm B, the standard deviation is 3-8 mm. Compute the statistic you would use to test whether the products of firm A have the same variability as those of firm B and test its significance. t Jetiey W -

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