SAT, 06.02.2021 14:00, oliviaschmitt0

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 that the thread has become inferior?

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It has been found from experience that the mean breaking strength of a particular brand of thread is...