Question: 1. Why is it difficult to establish causal inference from observational data sets, compared to randomized experiments? 2. Find information about a procedure called p-hacking

1. Why is it difficult to establish causal inference from observational data sets, compared to randomized experiments? 2. Find information about a procedure called "p-hacking" and briefly explain why it is a perilous practice. 3. Briefly explain the concept of "statistical significance" and discuss the differences between statistical significance and economic (practical) significance. Is one more important than the other one

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