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# Fair tests

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### Fair tests

1. 1. Fair Tests Types of Variables
2. 2. Variables arethings that vary and change
3. 3. VariablesIn any experiment there are 3 variables: An independent (changed) variable A dependent (measured) variable Some control variablesLet’s look at each type…
4. 4. Independent Variable This is the thing you decide to changeeg. Investigating how plants grow when they are given different amounts of water You change the amount of water you give the plant. So, amount of water is the independent variable.
5. 5. Dependent Variable This is the thing that changes as a result. This is the thing you measureeg. Investigating how plants grow when they are given different amounts of water You measure how much the plant grows. So, amount of growth is the dependent variable.
6. 6. Control Variables These are all the things that must not change to make it a fair test. They must be kept the same. You need to keep the plants in the same place so that they get the same amount of sunlight or shade. You need to grow the plants in the same type of pot, that are the same size. The plants need to have the same type and same amount of potting mix. These are the control variables.
7. 7. Summary The independent variable is changed.  Amount of water The dependent variable is measured.  Growth of plant. The control variables are kept the same.  Amount of sunlight or shade.  Type of pot.  Size of pot.  Type of potting mix, etc.