Validity

Validity is whether the experiment you are testing is true or not and if it actually measures what you are trying to measure.

The validity of this experiment is high as it does measure participant's favour towards their specific colours and results will show if they had chose more of their favourite colour than others or not. It is fairly accurate and is very successful to test people bias towards their favourite colour. This was ensured by the colour preferences of each person and even though everyone had different favourite colours, majority of the participants all chose more M&Ms of their favourite colour than others.
The controlled variables helped achieve this as a more accurate test was created by using the same age group teenage girls so that all test could be as valid as possible. Another variable that ensured validity was the same amount of M&Ms in the bowl of each colour. This was controlled by maintaining and replacing the colours which had been picked to ensure an equal possibility of all colours getting picked. This test has been proven to be valid as it cannot be valid if it isn't reliable.
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