Answer:
They did not repeat their tests multiple times.
Explanation:
It may seem that the question is incomplete. The complete question is as below:<em> Dominic and Eva are using the same type of stopwatches to measure the time it takes for a chemical reaction to occur. They each use the same stopwatch to measure the time. These are their results:
</em>
<em>Dominic: 78 seconds
</em>
<em>Eva: 81 seconds
</em>
<em>
Why are their results unreliable and can lead to a pseudoscientific claim?
</em>
<em>
They did not repeat their tests multiple times.
</em>
<em>They used the same type of stopwatch.
</em>
<em>They did not change the reactants in their chemical reactions.
</em>
<em>Only one person should have collected the data.</em>
<u>Dominic and Eva's results are unreliable and can lead to a pseudoscientific claim because they did not repeat their tests multiple times. </u>
Repeating the test multiple times and finding the average of the measurement will minimize the chance of having error in the measurement and improve the accuracy of the outcome.
Thus, without repeated measurement, the reliability and the validity of the measurement would be in doubt.
