A survey in two sites of a firm included the following question: “How effective is management in responding to legitimate grievances of workers?” The results are shown here: Number Surveyed Number...

A survey in two sites of a firm included the following question: “How effective is management in responding to legitimate grievances of workers?”  The results are shown here:

Let A be the event a worker comes from Site 1.  Let B be the event the response is “poor.”

a.  Compute P(A ᴜ B).

b.  Are the events A and B independent? Support your answer with statistical proof.