How do we test for statistical significance, and why is statistical significance important?

1.How do we test for statistical significance, and why is statistical significance important? Give some examples from your experience where understanding statistical significance could have been important in making a good decision or where a lack of understanding statistical significance could have led to a poor decision.
2.What are the two forms of one-tailed hypothesis tests and what is the one form of the two-tailed hypothesis test? Provide practical examples of a one-tailed and two-tailed hypothesis.

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