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