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 because of concerns other stolen recipes black pepper care; Do not grasp the production costs of the black pepper family, due in the production process is not open to books; Answer in a State of ambiguity do not remember clearly, ... 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 the removal of this unusual element out of the research database.
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