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What is the significance of sampling in a statistics-based study? Please give examples of three real-world scenarios where we have no choice but to work

  1. What is the significance of sampling in a statistics-based study? Please give examples of three real-world scenarios where we have no choice but to work with samples and why is that the case.
  2. Let A be the event "It will rain today;" let B be the event "I will do the grocery shopping today." Apply the general addition rule of probability to find P(A or B). Assume that events A and B are independent. Assume that P(A)=0.3 and P(B)=0.6.

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