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OSEM

OSEM. A writing rubric for “describe” or “explain” questions in Maths and Stats. Presented by Jeremy Brocklehurst. Examples of describe/explain questions.

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OSEM

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  1. OSEM A writing rubric for “describe” or “explain” questions in Maths and Stats. Presented by Jeremy Brocklehurst

  2. Examples of describe/explain questions Compare the distribution of the weights of Sara’s box of Nutty Snack Bars with the expected distribution of the weights if the machine is working properly. Use statistical terms to explain your answer.

  3. Heights of male and female students from the South African Census @ School Database Describe features of the distributions comparatively.

  4. And even in Scholarship Calculus:

  5. When given an “explain”, “describe” or “compare and contrast” task: What are common difficulties that students have?

  6. OSEM – how does it work?

  7. OSEM – how does it work?

  8. What the OSEM writing frame means: O stands for Obvious observations Write down one thing you notice, then leave a gap, and write down something else you notice. Try to get 3 obvious things. S is for Specific Under each obvious observation, explain what you mean so that another person would get it. E is for Evidence Support each observation with numbers or calculations. M is for Meaning: So what? Write down what each of your points tells you about the original problem/situation. What else could we find out?

  9. What the OSEM writing frame means: O stands for Obvious observations: Write down one thing you notice, then leave a gap, and write down something else you notice. Try to get 3 obvious things. S is for Specific: Under each obvious observation, explain what you mean so that another person would get it. E is for Evidence: Support each observation with numbers or calculations. M is for Meaning: So what? Write down what each of your points tells you about the original problem/situation. What else could we find out?

  10. What the OSEM writing frame means: O stands for Obvious observations: Write down one thing you notice, then leave a gap, and write down something else you notice. Try to get 3 obvious things. S is for Specific: Under each obvious observation, explain what you mean so that another person would get it. E is for Evidence: Support each observation with numbers or calculations. M is for Meaning: So what? Write down what each of your points tells you about the original problem/situation. What else could we find out?

  11. What the OSEM writing frame means: O stands for Obvious observations: Write down one thing you notice, then leave a gap, and write down something else you notice. Try to get 3 obvious things. S is for Specific: Under each obvious observation, explain what you mean so that another person would get it. E is for Evidence: Support each observation with numbers or calculations. M is for Meaning: So what? Write down what each of your points tells you about the original problem/situation. What else could we find out?

  12. What the OSEM writing frame means: O stands for Obvious observations: Write down one thing you notice, then leave a gap, and write down something else you notice. Try to get 3 obvious things. S is for Specific: Under each obvious observation, explain what you mean so that another person would get it. E is for Evidence: Support each observation with numbers or calculations. M is for Meaning: So what? Write down what each of your points tells you about the original problem/situation. What else could we find out?

  13. What the OSEM writing frame means: O stands for Obvious observations: Write down one thing you notice, then leave a gap, and write down something else you notice. Try to get 3 obvious things. S is for Specific: Under each obvious observation, explain what you mean so that another person would get it. E is for Evidence: Support each observation with numbers or calculations. M is for Meaning: So what? Write down what each of your points tells you about the original problem/situation. What else could we find out?

  14. In the Level 1 Multivariate Data standard (1.10), my students found OSEM a useful guide when writing their conclusions:

  15. 1.10 Multivariate – Conclusion Obvious

  16. 1.10 Multivariate – Conclusion Obvious (Make call: Yes/No)

  17. 1.10 Multivariate – Conclusion Obvious Specific

  18. 1.10 Multivariate – Conclusion Obvious Specific (about what? – popns / variable)

  19. 1.10 Multivariate – Conclusion Obvious Specific Evidence

  20. 1.10 Multivariate – Conclusion Obvious Specific Evidence (justify, support with stats) Meaning

  21. 1.10 Multivariate – Conclusion Obvious Specific Evidence (justify, support with stats) • Meaning (so what?) • Context (does it make sense etc.? • Sampling variability

  22. 1.10 Multivariate – Conclusion Obvious Specific Evidence Meaning

  23. 1.10 Multivariate – Conclusion Obvious (Make call: Yes/No) Specific (about what? – popns / variable) Evidence (justify, support with stats) • Meaning (so what?) • Context (does it make sense etc.? • Sampling variability

  24. 1.10 Multivariate – Conclusion

  25. 1.10 Multivariate – Conclusion

  26. And even in Level 2 Coordinate Geometry

  27. And even in Level 2 Coordinate Geometry Obvious observations Specific (labelling) Evidence (calculations) Meaning (so what?) (Relate back to problem)

  28. School students are paid to deliver weekly advertising leaflets to houses. (b) Leaflets delivery co. pays them per bundle of 50 leaflets. If a student delivers more than 300 leaflets they are paid more per bundle. (a) Leaflets from us – pay a fixed amount per leaflet

  29. In groups: • Each person has a sheet. • Each person fills in one Obvious observation. • Then pass it to the next person in your group. They fill in the “Specific” part for your observation • AND • Write their own Obvious • Observation in one of the other • boxes. • Continue in this way, passing each • sheet around until OSEM are completed for all 4 boxes. • 4. Then have a go at the Extended Abstract part.

  30. Success Criteria: OSEM

  31. Examples of describe/explain questions School students are paid to deliver weekly advertising leaflets to houses. (b) Leaflets delivery co. pays them per bundle of 50 leaflets. If a student delivers more than 300 leaflets they are paid more per bundle. (a) Leaflets from us – pay a fixed amount per leaflet Explain how and why the graph in part (b) is different to the graph in part (a).

  32. (b) Leaflets delivery co. pays them per bundle of 50 leaflets.

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