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# ISA Variables

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ISA, investigstion skills assessment, variables

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### ISA Variables

1. 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.
3. 4. What type of variable is shown in this column?
4. 5. Independent variable
5. 6. What is the nature of the variable is shown in this column?
6. 7. This is a discrete variable – (whole number of turns)
7. 8. What type of variable is shown in this column?
8. 9. Independent variable – also discrete (whole numbers of turns.)
9. 10. What type of variable is shown in this column?
10. 11. Independent variable, This one is continuous (can take any value).
11. 12. What type of variable is shown in this column?
12. 13. Dependent variable – this one is continuous – can take any value.
13. 14. What type of variable is shown in this column?
14. 15. Dependent variable – this one is a categoric variable– its value is described in words.
15. 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.
16. 17. What type of variable is shown in this column?
17. 18. This is a control variable – to ensure this is a fair test.
18. 19. What type of variable is shown in this column?
19. 20. This is an independent variable – it is also a continuous variable
20. 21. What type of variable is shown in this column?
21. 22. This is a dependent variable – it is also a continuous variable.
22. 23. What type of variable is shown in this column?
23. 24. This is a dependent variable – it is also a category variable.
24. 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.
25. 28. What type of variable is shown in this column?
26. 29. Independent variable – This is also a continuous variable – any value of cement could be taken
27. 30. What type of variable is shown in this column?
28. 31. Dependent variable – The value is discrete because only multiples of 10N were available