1

Conducting a fair test for experiments is important as it helps to prove that the outcome is attributed only to the manipulative variables.

2

A fair test is a test (experiment) where only one variable (the one we are testing) is changed. The other variables are kept constant.

3

Know Your Variables

a)

Changed variable (independent variable) : Only one variable is changed for an experiment.

b)

Variables kept constant (controlled variables) : Other than the independent variable, all other variables that could affect the experiment to be kept constant

c)

Variable we measure (dependent variable) : Observations and measurements to be taken for the experiment.

4

Try this example taken from 2014 P4 SA2 Paper from Henry Park. 

Answers given :

Question 37b)  The number of times stirred

Question 37c) The temperature of the hot drinks and the type of cup