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# ISA Variables

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ISA, investigstion skills assessment, variables

ISA, investigstion skills assessment, variables

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### Transcript

• 1. ISA <ul><li>The nature and type of variables in investigation skills assessments. </li></ul>28 January 2011
• 2.
• 3. A student obtained these results while doing an investigation to determine the possible link between the number of primary and secondary turns and the output voltage and power output of a transformer.
• 4. What type of variable is shown in this column?
• 5. Independent variable
• 6. What is the nature of the variable is shown in this column?
• 7. This is a discrete variable – (whole number of turns)
• 8. What type of variable is shown in this column?
• 9. Independent variable – also discrete (whole numbers of turns.)
• 10. What type of variable is shown in this column?
• 11. Independent variable, This one is continuous (can take any value).
• 12. What type of variable is shown in this column?
• 13. Dependent variable – this one is continuous – can take any value.
• 14. What type of variable is shown in this column?
• 15. Dependent variable – this one is a categoric variable– its value is described in words.
• 16. A student obtained these results while doing an investigation to determine the possible link between the pH (acidity) of water used on germinating cress seeds and their growth and colour.
• 17. What type of variable is shown in this column?
• 18. This is a control variable – to ensure this is a fair test.
• 19. What type of variable is shown in this column?
• 20. This is an independent variable – it is also a continuous variable
• 21. What type of variable is shown in this column?
• 22. This is a dependent variable – it is also a continuous variable.
• 23. What type of variable is shown in this column?
• 24. This is a dependent variable – it is also a category variable.
• 25.
• 26.
• 27. A student obtained these results while doing an investigation to determine the strength of a concrete block as the percentage cement in the mix varies.
• 28. What type of variable is shown in this column?
• 29. Independent variable – This is also a continuous variable – any value of cement could be taken
• 30. What type of variable is shown in this column?
• 31. Dependent variable – The value is discrete because only multiples of 10N were available