when you choose the group you think will represent the sample

when any member of the population is equally likely to be chosen for the sample

Counting Random Plants

Using Quadrats

Using Pooters

Using Pitfall traps

A type of bike

A sampling tool typically of one square metre, used to sample plants

A sampling tool typically of one square metre, used to sample animals

A type of hat

quadrats should be placed randomly so that a representative sample is taken

you should look at the results from several quadrats in an area to reduce the effect of an unusual distribution

the results are more reliable when you look at the results from many quadrats

All the above are true

Place it where you like

Divide the sample area into a grid and use a random number generator to choose a square.

Throw the quadrat so it's random

Divide the sample area into a grid and choose a square.