Sampling Methods Flashcards

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  • Make sure you understand the information on each card. If something's unclear, click the link to the revision notes at the bottom of the page for more details.

2️⃣ Test yourself:

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3️⃣ Consistently Review and Practice:

  • Use spaced repetition: spend more time on the cards you struggle with and go over them more often.
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Note: We may include questions that have multiple correct answers. It's useful to remember specific examples to understand these concepts better.

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In science, what is meant by sampling?

Sampling means collecting data from a small part of a larger group, so you can make conclusions about the whole group.

Why do scientists use sampling instead of measuring every organism?

Sampling is quicker, cheaper and easier. Sometimes it is not possible to measure every organism in a population.

In sampling, what is a population?

A population is all the organisms or items in the group you are interested in, such as all the daisies in a field.

What is a random sample?

A random sample is one where every member of the population has an equal chance of being chosen.

What is a quadrat used for in sampling?

A quadrat is a square frame used to mark out a small area. You count the organisms inside it to estimate numbers in a larger area.

How can you take a random sample in a field using quadrats?

Mark out the field with measuring tapes. Use random numbers to choose coordinates. Place the quadrat at each coordinate and count the organisms inside.

What is systematic sampling?

Systematic sampling is when you take samples at regular intervals, for example every 2 metres along a line.

What is a transect used for in sampling?

A transect is a line across a habitat. You take samples along the line to see how the number or type of organisms changes.

What is a representative sample?

A representative sample has similar features to the whole population. It reflects what the whole group is like.

Why should the same sampling method be used each time in an investigation?

Using the same method each time makes the test fair. It means the results can be compared.

Name two tools that can be used to sample organisms in a habitat.

Two tools used in sampling are quadrats and pitfall traps. Sweep nets are another example.

When is it useful to use systematic sampling along a transect?

It is useful when you think conditions change across an area, such as from the edge of a path into a wood, and you want to see how organisms change too.

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