Unformatted text preview: MATH 2300 —18, STATISTICAL METHODS, Spring 2011
Exam  2 Find the mean of the binomial random yariab . A: 2 \L ' POL) ' 210‘ , U
1) The probability that a person has immunity to a particular disease is (_)_.__6. Find the mean for the 1) [3
random variable )‘gthe number Who have immunity in samples of Size 26.
A) 10.4 F C) 12.8 D) 13.0 E) 0.6. Find the probability using complements. P(ﬁ C) ‘3 [' QC A) 17' I " . C] U D
2) Suppose that on a particular multiple chorce questiortﬂof the students answered correctly. 2)
What is the probability that a randomly selected student answered estion incorrectly?
’ A) 1.04 B) 0.48 C) 0.96 ﬂ E) 24.00 Provide an appropriate response. '
3) Both parents are carriers for an inheritable trait so that the probability their child possesses the trait 3) ‘ 2
is 25%. Given that the couple has 4 children, which of the following is true? '
A)—It is impossible that all four children possess the trait
B) Exactly one of the children must possess the trait . At least two of the children must possess the trait L . '5'. It is possible that none of the four children possess the trait 1  "
Pm * PCB)  PCA M 6)
% w  . 4) E.
19 2 3 .
A) 0. 64—9. ‘3“ 17%qu D)l. E)—..4—I"_,
F0" 6‘ ISd 0! n+5 do Nbi Subwacr Pom: 3)  “a"?
5) Suppose the following tree diagram summarizes the responses of 500 people to two questions, 5) where the first response is either yes or no and the second is multiple choice with three possible
answers (A, B or C). Use the tree diagram to calculate the probability that a person answered B to the multiple choice quation. A (0.1) 5707? (.114) .01 A) 0.4 mm C) 0.07 D) 0.04 E) 0.7 ...
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