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When 12 bolts are tested for hardness, their indexes have a standard deviation of 41.7. Test...

When 12 bolts are tested for hardness, their indexes have a standard deviation of 41.7. Test the claim that the standard deviation of the hardness indexes for all such bolts is greater than 30.0. Use a 0.025 level of significance. Assume that the population is normally distributed and the sample has been randomly selected.  

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