This is not a valid conclusion because the data was not randomly collected from various classes in the school but from a particular class.
The collection of data for a research work should be done in such a way as to include a good number of the test subjects.
The sampling methods that can be used to gather better data include the following:
These methods will ensure that a good number of the test subjects are included in the research work in order to form a valid conclusion.
Learn more about sampling methods here:
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