Description
suppose a sample of 787 floppy disks is drawn. Of these disks 86 were defective. Using the data estimate the proportion of disks which are defective enter your answer as a decimal rounded to 3 decimal points
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Explanation & Answer
The best estimate of the proportion should be 86/787 = 0.109
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Age Group
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account for the entire difference in crude heart disease rates between the two
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1. The following table describes hypothetical
age-specific rates of heart disease in India and the United States in 2009.
Also included are hypothetical age distributions for the two countries
and the entire world population.
Age Group
(in years)
% of Population in Age Group
Heart Disease Rate per
100,000 person-years
INDIA
U.S.A.
WORLD
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U.S.A.
< 30
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50%
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30%
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150
> 55
10%
30%
20%
120
400
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Calculate the crude rate
of heart disease for each of the two countries. Suppose that you want to
compare the rate of heart disease in India to that in the United States. You
know that age is an important risk factor for heart disease. Examine the age
distribution of each country’s population.
·
Should you use the two
crude rates to compare the two countries? Why or why not?
·
Calculate an
age-adjusted rate for heart disease in each country. Use the age distribution
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·
Based on these answers,
would you say that the age differences between India and the United States
account for the entire difference in crude heart disease rates between the two
countries? Why or why not?
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