At the start of the new factory Construction of the plant can produce 1550 pieces per day on average after using the machine over a two-year plant is still believed. The average number of products produced per day this machine. Remain the same But the collection of data on the number of items that this machine. Produced during 81 days ago appear to have produced an average of only 1535 pieces and a standard deviation of 60 pieces of cargo per day on average, this machine can produce per day. Unlike traditional or not, at the 0.05 significance level.