ISA Variables
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This document describes variables in three scientific investigations: 1) A study of transformer output based on primary and secondary coil turns which identified independent discrete and continuous variables and dependent continuous and categorical variables. 2) A study of cress seed germination based on water pH which identified control, independent continuous, and dependent continuous and categorical variables. 3) A study of concrete strength based on cement percentage which identified an independent continuous variable and dependent discrete variable.
ISA Variables
- 1. ISA The nature and type of variables in investigation skills assessments. 28 January 2011
- 2. 油
- 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?
- 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. 油
- 26. 油
- 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