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1. It has been found from experience that the mean breaking strength of a particular brand of thread is 9.63N with a standard deviation of

1. It has been found from experience that the mean breaking strength of a particular brand of thread is 9.63N with a standard deviation of 1.40N. Recently a sample of 36 pieces of thread showed a mean breaking strength of 8.93N. Can we conclude at 5% level of significance that the thread has become inferior?

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