is it possible to predict buy above & sell below levels from last week high and low

#1
hi,
i am having one doubt. technical experts pls clear my doubt. i have seen some technical analyst suggesting particular stock with buy above and sell below range for next week trading. how they are predicting next week position. is it possible to predict next week position using last week high and low prices. if so pls explain me about the formula.
by,
raj.
 

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