Ensuring Validity: |
In order to make sure the investigation was valid, I had to make sure the investigation was testing the hypothesis and would also bring results that achieved the aim. To do this, all the controlled variables had to be kept constant and only the independent variable was allowed to change. This includes using more than one plant when testing transpiration rates. Both plants were to be exposed to the exact same light and environmental conditions, as well as being given the same amount of time to transpire under these conditions. Also, only two leaves of each plant were inside the bottles to further ensure validity.
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Ensuring Reliability: |
When ensuring reliability, the investigation had to be repeated to make sure there were no outliers in the results. As the numbers became consistent, the experiment was reliable. This is shown in the results as the numbers in both the first and second experiment are similar. If more plants were used or the experiment was repeated even more, the investigation's reliability would have increased.
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