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You are given a few weeks of daily prices for one stock and a Signal column from an unknown system. How do you evaluate the signal's predictive power and check the quality of the data?

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You are given a few weeks of daily data for one stock (Date, Open, High, Low, Close, Adj Close) plus a column 'Signal', said to be the output of an AI system. (1) Evaluate the predictive power of the signal for the stock price, with no further information about how the signal is meant to be used. (2) Review the quality of the data: list every potential error you find, the quality check that found it, and the corrected value you propose.

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