Two processes for manufacturing large roller bearings are under study. In both cases, the diameters (in centimeters) are being examined. A random sample of 21 roller bearings from the old manufacturing process showed the sample variance of diameters to be s2 = 0.235. Another   random sample of 26 roller bearings from the new manufacturing process showed the sample variance of their diameters to be s2 =  0.128. Use a

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