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Please provide a correct, readable, and well explained solution for the following It has been found from experience that the mean breaking strength of a

Please provide a correct, readable, and well explained solution for the following

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It has been found from experience that the mean breaking strength of a thread is 9.72 oz and the standard deviation is 1.4 oz. Recently, a sample of 36 pieces of thread showed a mean breaking strength of 8.93 02. Can one conclude at a level of signicance of 0.05 that the thread has become inferior

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