![]() ![]() what they change (independent variable) and what they measure (dependent variable). The type of graph that is appropriate depends on the type of variable used for the key variables i.e. It also helps the pupils to develop understanding by relating pattern and trends to their scientific knowledge. This gives a picture of the information they have collected and helps them to identify patterns and trends. Graphs and charts are powerful tools because they enable pupils to see the result of what they changed (the independent variable) affecting what they measured (the dependent variable). The production of the table of results will help the pupils in constructing a bar chart or graph of their results.Īn average may need to be taken to get more accurate results. The table includes the independent variable (what they were changing) and the dependent variable (what they were measuring). The pupils are encouraged to record the results from their investigation by producing a table of results. ![]() Note: the words independent variable and dependent variable do not need to be taught at this stage! Most pupils need only say that they intend to keep certain things the same, but the most able pupils should be encouraged to discuss what value each control variable should have.You will need to encourage the pupils to make sure that all relevant aspects have been controlled (kept the same).It is easier to recognise that a test is fair than it is to plan and carry out a fair test.It is only by carrying out a fair test that you can be sure that it is what you have changed (independent variable) that is affecting what you measured (dependent variable).If, for example, two things change, say temperature and humidity, you cannot be sure which of these causes the change in the dependent variable it may be temperature or it may be humidity or it may be a combination of both. Often the more ‘obvious’ a variable is, the more likely it is to be controlled, but the pupils should be trained to consider their set-up and decide on the variables to be controlled.Ī fair test is one in which only the independent variable is seen to cause a change in the dependent variable. The pupils should be taught to control the variables other than the dependent and independent variables in a conscious way. The concept of a fair test is crucially important in planning an investigation. ![]()
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