Corrects figures: in the process of investigating the interview farmers cultivate black pepper will not avoid encountering a number of difficulties, including: The provision of information to answer incorrectly due to the following causes: want to conceal information, do not grasp the situation of production and the cost of production of the black pepper family , reply in vague status do not remember, ... lead to fragmented data, do not represent the actual nature of the activity of producing black pepper. To detect the false information, the author will use dispersion diagram (Scatter Plot) to detect and make removing them out of the database.
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