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## E-Book Chapter Eight 8.62 Solutions

by: smartwriter Notetaker

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# E-Book Chapter Eight 8.62 Solutions

Marketplace > E Book Chapter Eight 8 62 Solutions
smartwriter Notetaker
CSU - Dominguez hills
GPA 3.0

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E-Book Chapter Eight 8.62 Solutions
COURSE
PROF.
No professor available
TYPE
Study Guide
PAGES
2
WORDS
KARMA
50 ?

## Popular in Department

This 2 page Study Guide was uploaded by smartwriter Notetaker on Sunday November 15, 2015. The Study Guide belongs to a course at a university taught by a professor in Fall. Since its upload, it has received 19 views.

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Date Created: 11/15/15
8.62 In 1992, the FAA conducted 86,991 pre­employment drug tests on job applicants who were  to be engaged in safety and security­related jobs, and found that 1,143 were positive.  (a) Construct a 95 percent confidence interval for the population proportion of positive  drug tests.  p= 1143 =0.0131392903 86991 The formula for population proportionconfidenceintervalsisthis: p(1−p ) p±Z α √ n 2 Sinceαis0.051−.95 ,thenz =z =z 2 0205 0.025 0.025.96 p±Z α p(1−p ) 2 √ n 0.01313929031−0.0131392903 ) ¿0.0131392903±1.96× √ 86991 ¿0.0131392903±1.96× 0.129666493 √ 86991 ¿0.0131392903±1.96×0.0012208905 ¿0.0131392903±0.0023929454 ¿ 0.0107463449,0.015532235) ≈ (0.011,0.01) Theconfidenceinterval at95 of the population proportion of positivedrugtestsis (0.011,0.01) (b) Why is the normality assumption not a problem, despite the very small value of p?  (Data are from Flying 120, no. 11 [November 1993], p. 31.) Thesample¿reallylarge.Normality would probablynot bea problem. Anyways ,theconditions arenp≤5∧nq≤5

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