Population Demography

Free Response

Describe how a researcher would determine the size of a penguin population in Antarctica using the mark and release method.

Hint:

The researcher would mark a certain number of penguins with a tag, release them back into the population, and, at a later time, recapture penguins to see what percentage of the recaptured penguins was tagged. This percentage would allow an estimation of the size of the penguin population.

The CDC released the following data in its 2013 Vital Statistics report.

Age interval Number dying in age interval Number surviving at beginning of age interval
0-10 756 100,000
11-20 292 99,244
21-30 890 98,953
31-40 1,234 98,164
41-50 2,457 96,811
51-60 5,564 94,352
61-70 10,479 88,788

Calculate the mortality rate for each age interval, and describe the trends in adult and childhood mortality per 100,000 births in the United States in 2013.

Hint:

Mortality is calculated as [(Number Dying)/(Number Surviving)] x 1000 so the completed life table should read:

Age interval Number dying in age interval Number surviving at beginning of age interval Mortality rate
0-10 756 100,000 7.56
11-20 292 99,244 2.94
21-30 890 98,953 8.99
31-40 1,234 98,164 12.6
41-50 2,457 96,811 25.4
51-60 5,564 94,352 58.97
61-70 10,479 88,788 118.0

The table shows that mortality is high among very young children Americans (under age 10), then falls for teens and young adults. Mortality starts rising again in middle age, nearly doubling from the 50s to the 60s.