excercices:
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Excercices:. Q4.3.4 : Page 111 The same survey data base cited shows that 32 percent of U.S adults indicated that they have been tested for HIV at some points in their life .Consider a simple random sample of 15 adults selected at that time .Find the probability - PowerPoint PPT PresentationTRANSCRIPT
Excercices:Q4.3.4: Page 111The same survey data base cited shows that 32 percent of U.S adults indicated that they have been tested for HIV at some points in their life .Consider a simple random sample of 15 adults selected at that time .Find the probability
that the number of adults who have been
tested for HIV in the sample would be:
Text Book : Basic Concepts and Methodology for the Health Sciences
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Solution
n=15 , p= 0.32 ,q= 1-p=0.68
( ) ( ) , 0,1,2,....,X n Xn
f x P X x p q x nx
Text Book : Basic Concepts and Methodology for the Health Sciences
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•(a )Three (Ans. 0.1457)
•(b ) Less than two ) . 0.02477(Ans
(c ) At most one ) . 0.02477Ans (
•(d )At least three (Ans. 0.9038)
(e ) ,between three and five inclusive.
Text Book : Basic Concepts and Methodology for the Health Sciences
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Q4.3.5 • refer to Q4.3.4 , find the mean and the
variance?
•(Answer: mean = 4.8, • variance =3.264
•Standard deviation= 1.807• )
Text Book : Basic Concepts and Methodology for the Health Sciences
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