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I am learning Data Science and I have a confusion in one topic. I would like to describe my approach.

  1. I have understood the problem statement.
  2. I have used snowflake schema to join tables that have the attributes required for the job.
  3. I have formulated the dataset.

Now, I am facing a question that how would I know which independent variables are actually significant for the problem. I got a hint that hypothesis testing procedures are used for determining the variable importance. Can someone please tell me that why do we use p-value, z-test, ANOVA test if we can easily find the co-relation through the correlation matrix in python?

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