Experimental Design
The variable which we change.
Independent variable
How many variables do we change for a fair test?
Just 1
Identify the variables in the following research question:
How does the amount of rain affect the production of corn in a Victorian farm?
IV - amount of rain
DV - production of corn in a Vic farm
Suggest two controlled variables for the following:
Investigating how the number of coils in an electromagnet affects how many paper clips can be picked up by the magnet.
For example:
- voltage of the power supply
- core used
- wire used
- type/material/size of paper clips used
Suggest two controlled variables for the following:
Investigating how the number of coils in an electromagnet affects how many paper clips can be picked up by the magnet.
For example:
- voltage of the power supply
- core used
- wire used
- type/material/size of paper clips used