# Applied Statistics in Business and Economics Quiz 2 With Instructor Notes

Essay by babydoll77stlCollege, UndergraduateA+, August 2009

University of Phoenix OnlineCourse: RES / 341QUIZ # 2(Chapter 5+6+7 from Applied Statistics in Business and Economics )45 Questions [Each Question = 1 Point]SOLUTIONPlease mark one answer for all multiple choice questions with RED!Chapter 51. Events A and B are mutually exclusive whenA) the joint probability of the two events is zero.

B) they are independent events.

C) P(A)P(B) = 0D) P(A)P(B) = P(A | B)Answer: A2. Independent events A and B would be consistent with which of the following statements:A) P(A) = .3, P(B) = .5, P(A B) = .4B) P(A) = .4, P(B) = .5, P(A B) = .2C) P(A) = .5, P(B) = .4, P(A B) = .3D) P(A) = .4, P(B) = .3, P(A B) = .5Answer: B3. The probability of event A occurring given event B has occurred is an example ofA) a marginal probability.

B) a conditional probability.

C) a joint probability.

D) the intersection of two probabilities.

Answer: B4. If each of two independent file servers has a reliability of 93% and either alone can run the web site, then the overall web site availability isA) 0.9951B) 0.8649C) 0.9300D) 0.9522Answer: AP ( A) = .93 P (B) = .93 P (A Ã¢ÂÂ© B ) = .93*.93 = .8649P (A U B ) = P (A) + P (B) - P (A Ã¢ÂÂ© B )= .93 + .93 - .8649= .9951Use the following to answer 5 - 95. P(V ) is approximatelyA) .20B) .40C) .50D) .80Answer: DP ( V ) = = .2Hence P ( V') = 1- P (V)= 1 - .2= .86. P(W S) is approximatelyA) .12B) .30C) .40D) .58Answer: AP ( W Ã¢ÂÂ© S ) = = .127. P(A M) is approximatelyA) .25B) .50C) .625D) .125Answer: CP(A M) = P (A) + P ( M) - P ( A Ã¢ÂÂ©...