I can tell the difference between a population and a sample. 

I can determine if a sample is representative of a population. 

I can generate random samples. 

POPULATIONS, SAMPLES, AND REPRESENTATIVE SAMPLES

A population is an entire group of objects—people, animals, plants—from

which data can be collected. A sample is a subset of the population. When

you ask a statistical question about a population, it is often more efficient

to gather data from a sample of the population.

A representative sample of a population has the same characteristics as the

population. Generating a random sample is one reliable way to produce a

representative sample of a population.

You can generate multiple random samples that are different but that are each

representative of the population.

DIAGRAM: A POPULATION AND A RANDOM SAMPLE

The diagram shows a population of 12 numbered people with different colors.

Population (left to right):

1 (blue), 2 (red), 3 (green), 4 (red), 5 (green), 6 (green),

7 (red), 8 (red), 9 (red), 10 (blue), 11 (blue), 12 (red).

The random sample is made up of individuals 2 (red), 5 (green),

9 (red), and 12 (red). Arrows connect those selected members of the

population to the four-person sample.