MathBench > Environmental Science

Sampling

 

Sampling on a grid

sample of ice creamFirst thing first, what is a random sample?

To count the dandelions, we'll first create a grid, then use the computer's random number generator to tell us which grid squares to count. We'll do this 10 times, because, as you'll see, the counts in the different grid squares will vary a lot.

After you count 10 squares, you'll use the average number per square to estimate the population of the entire lawn.

 

Look at the applet's final message -- how close was your estimate?