At the start of the new factory The machinery of the factory can produce per day on average, 1550 pieces. After using machinery for 2 years. This factory owner still believe that. The average number of goods this machine to produce per day, still the same.Produced in the 81 days. That produced an average of only, 1535 pieces and standard deviations of 60 pieces per day. The average number of goods this machine to produce per day, different from the original, or at the level of significance 0.05.
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