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Science lesson plan · 6th grade (Year 7 in England) · 30 minutes

Drawing conclusions from evidence

Working scientifically

CCSS NGSS.SEP 4CCSS NGSS.SEP 7England: KS2 Y5–Y6 Working scientificallyEngland: KS3 Working scientifically

Objective and success criteria

Students will: Drawing conclusions from evidence.

  • I can answer questions on today's skill on my own, without help.
  • I can explain each step and say why it works.
  • I can check my answer and spot a mistake.

Before and after

Needs first: Independent, dependent and control variables; Reading tables and line graphs

Leads to: Evaluating experiments (research summaries)

Materials: Simple equipment for a fair test, Results table template, Mini whiteboards, A diagram or short video clip of the idea, Printed student sheet (below).

Warm-up · 4 min

  • Quick retrieval from earlier learning (Independent, dependent and control variables; Reading tables and line graphs). Students answer on mini whiteboards.
  • Show answers together and note who needs support in the main task.
  1. Investigation: Does the size of a parachute affect how long it takes to fall? Which is the independent variable (the one you change)? (time to fall / surface area of the water / size of the parachute / drop height) → size of the parachutePrompt: Independent variable: the one you change. Dependent variable: the one you measure.
  2. Investigation: Does the size of a parachute affect how long it takes to fall? Which is the dependent variable (the one you measure)? (drop height / time to fall / size of the parachute / distance the car travels) → time to fallPrompt: Independent variable: the one you change. Dependent variable: the one you measure.
  3. Investigation: How does the amount of light affect the growth of cress? Which is the independent variable (the one you change)? (height of the cress / type of soil / amount of light / water temperature) → amount of lightPrompt: Independent variable: the one you change. Dependent variable: the one you measure.

Hook · 3 min

  • Show a simple experiment with one thing changed and ask what makes it a fair test.
  • Share the objective: Drawing conclusions from evidence. Read the success criteria together.

I do: model it · 7 min

  • Work through the example out loud, saying why you do each step, not just what you do.
  • Example: A result does not match the prediction. What should a scientist do?
  • Step 1: Unexpected results are kept and investigated; sometimes the prediction was wrong.
  • Step 2: So the answer is: Record it and check whether the method was correct
  • Answer: Record it and check whether the method was correct
  • Pause after each step and ask a student to say what comes next.

We do: guided practice · 6 min

  • Do these together. Students try each step on whiteboards before you reveal it.
  • Use the hints as prompts rather than giving the answer.
  1. Plants given fertiliser grew 12 cm; plants without grew 7 cm. Only one plant of each was tested. What would make the conclusion stronger? (Using just one plant again / Giving one plant more water / Testing many plants in each group / Not measuring the plants) → Testing many plants in each groupPrompt: One plant might just be unusual.
  2. Conclusions: which statement is true? (Other scientists should be able to repeat your method and get similar results. / A conclusion can include amounts you did not test. / If two things happen together, one must cause the other. / You should ignore results that do not match your prediction.) → Other scientists should be able to repeat your method and get similar results.Prompt: Think about what results can and cannot show.

You do: independent practice · 7 min

  • Students work on the student sheet. Circulate and check the first two answers of every student early.
  • Students who finish: write a question of their own for a partner, with the answer.

The 6 questions are on the student sheet below, with answers in the key.

Exit ticket · 3 min

  • Two questions on their own. Sort answers into got it / nearly / not yet to plan the next lesson.
  1. Conclusions: which statement is true? (You should ignore results that do not match your prediction. / A conclusion can include amounts you did not test. / Two variables can be linked (correlated) without one causing the other. / If two things happen together, one must cause the other.) → Two variables can be linked (correlated) without one causing the other.Prompt: Think about what results can and cannot show.
  2. Which conclusion goes too far? Results: cress grew taller with more light, from 0 to 8 hours a day. (Between 0 and 8 hours, more light gave taller cress. / Light affected how tall the cress grew. / Cress will keep growing taller with any amount of light, even 24 hours. / Cress with no light grew least.) → Cress will keep growing taller with any amount of light, even 24 hours.Prompt: The test only went up to 8 hours.

Watch out for

  • Everyday meanings of words getting in the way of the science meaning: define key words explicitly.
  • Remembering facts without the reason: ask "why?" and "what is the evidence?"

Support and stretch

Support

  • Review first: Independent, dependent and control variables.
  • Use concrete materials: simple equipment for a fair test.
  • Give the first step of each question, or a partly worked example to finish.
  • Pair with a confident partner for the guided practice.

Stretch

  • Move on to: Evaluating experiments (research summaries).
  • Explain a common mistake in writing and how to fix it.
  • Write a word problem that uses today's skill, then solve a partner's.

Homework and more practice

Free online practice with hints and printable worksheets for this skill: eurekami.com/science/grade-6.

Free lesson plan from eurekami.com/lesson-plan-builder

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Drawing conclusions from evidence

Name

Date

Score/ 6

  1. Question 1

    Plants given fertiliser grew 12 cm; plants without grew 7 cm. Only one plant of each was tested. What would make the conclusion stronger?

    • A. Using just one plant again
    • B. Not measuring the plants
    • C. Testing many plants in each group
    • D. Giving one plant more water

  2. Question 2

    Conclusions: which statement is true?

    • A. A larger sample gives more trustworthy results.
    • B. You should ignore results that do not match your prediction.
    • C. A conclusion can include amounts you did not test.
    • D. If two things happen together, one must cause the other.

  3. Question 3

    Conclusions: which statement is NOT true?

    • A. A larger sample gives more trustworthy results.
    • B. Repeating an investigation makes results more reliable.
    • C. Two variables can be linked (correlated) without one causing the other.
    • D. You should ignore results that do not match your prediction.

  4. Question 4

    Results: the higher the ramp, the further the car rolled. Which conclusion fits?

    • A. Lower ramps make cars go further.
    • B. The ramp height has no effect.
    • C. Heavier cars always go further.
    • D. Increasing the ramp height increases the distance travelled.

  5. Question 5

    A result does not match the prediction. What should a scientist do?

    • A. Change the result to match
    • B. Delete the result
    • C. Record it and check whether the method was correct
    • D. Stop doing science

  6. Question 6

    Which conclusion goes too far? Results: cress grew taller with more light, from 0 to 8 hours a day.

    • A. Cress with no light grew least.
    • B. Between 0 and 8 hours, more light gave taller cress.
    • C. Light affected how tall the cress grew.
    • D. Cress will keep growing taller with any amount of light, even 24 hours.

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Answer key: Drawing conclusions from evidence

  1. 1. C. Testing many plants in each group

  2. 2. A. A larger sample gives more trustworthy results.

  3. 3. D. You should ignore results that do not match your prediction.

  4. 4. D. Increasing the ramp height increases the distance travelled.

  5. 5. C. Record it and check whether the method was correct

  6. 6. D. Cress will keep growing taller with any amount of light, even 24 hours.