Estimating Population Sizes

A _________________ is a group of objects or people.

• Sample

• Biased Sample

• Suvey

• Population

A _________ is surveying a part of the population.

• population

• sample

• survey

• random sample

We use the capture/re-capture method to _________________________.

• make guesses

• track animals

• estimate a population size

If the first step in the capture/re-capture method is capturing a sample of animals, what is the next step?

• capturing more

• tagging

• re-capturing

• releasing

Proportions help us solve for a estimated population size using the capture/re-capture method, true or false?

• True

• False

Select the correct proportion to use for estimating a population size.

• 
• 

Use a proportion to estimate each animal population size.

Total ducks counted: 1,100

Marked ducks counted: 257

Marked ducks: 960

Round to the nearest whole number.

• 295 ducks

• 4,109 ducks

• 1,056,000 ducks

• 294 ducks

A group of high school volunteers helped determine the lizard population of a local park. First, adult volunteers marked 87 lizards. Then, the students volunteers counted a total of 390 lizards in the park, 39 of which were marked. To the nearest whole number, what is the best estimate for the lizard population?

• 870 lizards

• 870

• 9 lizards

• 563 lizards

While studying the elk population, Dr. B and his research assistants marked 78 elk. Later, they flew over the area and counted 140 elk, of which 12 were marked. To The nearest whole number, what is the best estimation for the elk population.

• 21 elk

• 22 elk

• 7 elk

• 910 elk

Use a proportion to estimate a population size.

Total alligators counted: 310

Marked alligators counted: 16

Marked alligators: 90

Round to the nearest whole number.

• 56 alligators

• 55 alligators

• 27,900 alligators

• 1,744 alligators