Sampling

Unbiased sampling is:

• 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

Biased sampling is

• when you choose a population that is more likely to give you the result you want
• when you choose a group that is equally likely to be chosen

What is a suitable way to sample plants in a field?

• Counting Random Plants

• Using Quadrates

• Using Pooters

• Using Pitfall traps

What is a Belt Transect?

• A way of sampling a changing habitat

• A way of sampling a non-changing habitat

• A way of keeping up your pants

What is a quadrate

• 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

Which of the following is true about quadrates?

• 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

What is a suitable way to sample small invertebrates living on the ground.

• Quadrates

• Sweep nets

• Pitfall traps

• Water Sampling

When sampling daisies how will amount of light affect them?

• Less Light = More Daisies

• More Light = Less Daisies

• More Light = More Daisies

• Less Light = More Grass

What is the best way to place a quadrate?

• Place it where you like

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

• Throw the quadrate so it's random

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

Tn 1m² quadrats were placed in a 40m² field. On average 2 snails were found in every quadrat. Estimate the population size of the whole field.

• 2

• 10

• 40

• 80

• 20