Math lesson plan 路 8th grade (Year 9 in England) 路 45 minutes
Scatter graphs and correlation
Statistics and probability
CCSS 8.SP.A.1CCSS 8.SP.A.2CCSS 8.SP.A.3England: KS3 StatisticsEngland: GCSE Foundation Statistics
Objective and success criteria
Students will: Scatter graphs and correlation.
- 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: Coordinates in the first quadrant; Slope (gradient) of a line
Leads to: Linear regression and correlation coefficient; Describe association in scatter plots; Interpret correlation coefficients and avoid the causation trap
Materials: Squared paper for charts, Class survey data, Sticky notes for a live chart, Mini whiteboards and pens, Printed student sheet (below).
Warm-up 路 5 min
- Quick retrieval from earlier learning (Coordinates in the first quadrant; Slope (gradient) of a line). Students answer on mini whiteboards.
- Show answers together and note who needs support in the main task.
Hook 路 5 min
- Take a quick class survey (favorite fruit, travel to school) and ask what the results tell us.
- Share the objective: Scatter graphs and correlation. Read the success criteria together.
I do: model it 路 10 min
- Work through the example out loud, saying why you do each step, not just what you do.
- Model one question from the student sheet, thinking aloud.
- Pause after each step and ask a student to say what comes next.
We do: guided practice 路 10 min
- Do these together. Students try each step on whiteboards before you reveal it.
- Use the hints as prompts rather than giving the answer.
You do: independent practice 路 10 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 8 questions are on the student sheet below, with answers in the key.
Exit ticket 路 5 min
- Two questions on their own. Sort answers into got it / nearly / not yet to plan the next lesson.
Watch out for
- Forgetting to put data in order before finding the median.
- Reading a bar's height wrongly when the scale goes up in 2s or 5s.
Support and stretch
Support
- Review first: Coordinates in the first quadrant.
- Use concrete materials: squared paper for charts.
- 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: Linear regression and correlation coefficient; Describe association in scatter plots; Interpret correlation coefficients and avoid the causation trap.
- 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/math/grade-8.
Free lesson plan from eurekami.com/lesson-plan-builder