[See] When 12 bolts are tested for hardness, their indices have a standard deviation of 41.7. Test the claim that the standard deviation of the hardness
Question: When 12 bolts are tested for hardness, their indices have a standard deviation of 41.7. Test the claim that the standard deviation of the hardness indices for all such bolts is greater than 30.0. Use a 0.025 level of significance.
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