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Being unable to predict the future does not make it impossible to derive value from data analytics. Much of it comes down to the scope of the response to the findings of such analysis.

Would I bet my house on a sure-fire investment plan arising from analysis of past data. Certainly not! Would I take a closer look at credit card usage that correlated very strongly with past patterns of fraud. Very probably.

As Elijah said, we already make decisions all the time. The inability to make a decision that is guaranteed to be correct does not preclude the necessity of making your decisions on the best data available.