Random Sampling

This lesson looks at using quadrats to carry out random sampling, how to write a method and calculating means.

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

Quiz:

Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

Q1.What is the correct definition of interdependence?

1/8

Q2.Which of the following is an example of interdependence?

2/8

Q3.What is an abiotic factor?

3/8

Q4.Which of the following is a biotic factor?

4/8

Q5.Which of the following is NOT a human factor that can affect the population of an organism?

5/8

Q6.Foxes eat partridges. Partridges feed mainly on insects and wild plants (weeds). Some farmers spray their crops with chemicals to kill insects and weeds. How would this affect the number of foxes? Explain why.

6/8

Q7.Farmers spray chemicals on crops to kill unwanted weeds. What are these chemicals called?

7/8

Q8.The chemical in the spray might also....

8/8

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

Quiz:

Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

Q1.What is the correct definition of interdependence?

1/8

Q2.Which of the following is an example of interdependence?

2/8

Q3.What is an abiotic factor?

3/8

Q4.Which of the following is a biotic factor?

4/8

Q5.Which of the following is NOT a human factor that can affect the population of an organism?

5/8

Q6.Foxes eat partridges. Partridges feed mainly on insects and wild plants (weeds). Some farmers spray their crops with chemicals to kill insects and weeds. How would this affect the number of foxes? Explain why.

6/8

Q7.Farmers spray chemicals on crops to kill unwanted weeds. What are these chemicals called?

7/8

Q8.The chemical in the spray might also....

8/8

Video

Click on the play button to start the video. If your teacher asks you to pause the video and look at the worksheet you should:

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  • Click "Next" to view the activity

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Worksheet

These slides will take you through some tasks for the lesson. If you need to re-play the video, click the ‘Resume Video’ icon. If you are asked to add answers to the slides, first download or print out the worksheet. Once you have finished all the tasks, click ‘Next’ below.

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

Quiz:

Random Sampling

Don’t worry if you get a question wrong! Forgetting is an important step in learning. We will recap next lesson.

Q1.What is the definition of population?

1/8

Q2.What is the name of the piece of equipment in the image? [Credit: Manlius, Wikimedia Commons]

2/8

Q3.How do you ensure that the quadrat is placed randomly?

3/8

Q4.Which TWO ways would increase accuracy when using quadrats to count the number of plants?

Select two (2) boxes

4/8

Q5.Which of the following is the best method step?

5/8

Q6.The diagram shows the lawn with the positions of the flowers and the students’ 10 quadrats. What is the total number of flowers found in all 10 quadrats?

6/8

Q7.What was the total number of ragwort plants in 10 quadrats?

7/8

Q8.What was the mean number of ragwort plants in 1m²?

8/8

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

Quiz:

Random Sampling

Don’t worry if you get a question wrong! Forgetting is an important step in learning. We will recap next lesson.

Q1.What is the definition of population?

1/8

Q2.What is the name of the piece of equipment in the image? [Credit: Manlius, Wikimedia Commons]

2/8

Q3.How do you ensure that the quadrat is placed randomly?

3/8

Q4.Which TWO ways would increase accuracy when using quadrats to count the number of plants?

Select two (2) boxes

4/8

Q5.Which of the following is the best method step?

5/8

Q6.The diagram shows the lawn with the positions of the flowers and the students’ 10 quadrats. What is the total number of flowers found in all 10 quadrats?

6/8

Q7.What was the total number of ragwort plants in 10 quadrats?

7/8

Q8.What was the mean number of ragwort plants in 1m²?

8/8

Lesson summary: Random Sampling

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Time to move!

Did you know that exercise helps your concentration and ability to learn?

For 5 mins...

Move around:
Climb stairs

On the spot:
Dance