Let A denote the event that the next request for assistance from a statistical software consultant relates to the SPSS package, and let B be the event that the next request is for help with SAS. Suppose that P(A) =. 30 and P(B) = .50.
a. Why is it not the case that P(A) + (B) = 1?
b. Calculate P(A ′) .
c. Calculate P(A ∪B).
d.Calculate P(A′ ∩B′).
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