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.com/webapps/blackboard/execute/content/file?cmd=view&content;_id-909748-1&course; id-16828 1 A study relating smoking history to several measures of cardiopulmonary disability was recently reported. The data below were presented relating the number of people with different disabilities according to cigarette-smoking status Cardiopulmonary Cigarette-Smoking Status Disability 1215g/day No Smoker-Ex-Smoker 15g/day. No Disability Shortness of Breath Total 1857 512 10 12 6 611 13 18 415 19 21 319 13 15 Possible Infarction Total 540 650 460 21. What is the prevalence of ex-smokers in the sample? a. 0.256 b. 0.325 c0.3055 d. 0.27 22. What is the prevalence of shortness of breath in the sample? a. 0.256 b. 0.9285 c. 0.9481 d. 0.0275 23. What is the probability of a current smoker that smokes

Explanation / Answer

Result:

21).

P= 250/2000 = 0.325

22).

P=55/2000 =0.0275

23).

P=5/2000 = 0.0025

24).

P= 12/2000 = 0.006

27).

P= 95/125 = 0.76

28).

24/30 =0.80

29).

87/95=0.9158

30).

Sensitivity = 24/32=0.75

37).

Z value for 70, z =(70-42)/12 =2.33

P( x <70) = P( z < 2.33)

=0.9901

38).

Standard error = 12/sqrt(25) =2.4

Z value for 39, z =(39-42)/2.4 =-1.25

P( x <39) = P( z < -1.25)

=0.1056

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