A bolt manufacturer wants to investigate the machine that produces bolts with a diameter of 0.26 centimeters. If the variance of the diameters is equal to 0.02, then the machine is working as expected. A random sample of 20 bolts has a standard deviation of 0.2475. Does the manufacturer have evidence at the a = 0.005 level that the variance of the bolt diameters is more than required? Assume the population is normally distributed. Step 5 of 5: What is the conclusion? N

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