Tuesday

September 2, 2014

September 2, 2014

Posted by **Anonymous** on Sunday, March 6, 2011 at 11:17pm.

A) ARE A AND B INDEPENDENT?

B) FIND P(A&B)

C) FIND P(A OR B)

D) FIND P(A/B)

E) ARE B AND C MUTUALLY EXCLUSIVE EVENTS?

F) ARE B AND C INDEPENDENT EVENTS?

- stats -
**Sally**, Tuesday, June 10, 2014 at 10:33pmA) A and B are not independent: P(A)*P(B)= 0.25*0.30 = 0.075. This is not equal to P(A and B) = P(B|A)*P(A) = 0.48*0.25 = 0.12.

B) P(A and B) = P(B|A)*P(A) = 0.48*0.25 = 0.12.

C) P(A or B) = P(A) + P(B) - P(A and B) = 0.25 + 0.30 - 0.12 = 0.43

D) P(A|B) = P(A and B)/P(B) = 0.12/0.30 = 0.40

E) B and C are mutually exclusive, because it is given that P(B and C)=0 (Definition of mutual exclusivity.)

F) P(B)*P(C) = 0.30*0.55 = 0.165

P(B and C) = 0

==> The two quantities are not equal, hence B and C are not independent.

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