CHEM1001 Lecture 3: Chem 3

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1 Aug 2016
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Lecture 3
The control group contains every feature of the experimental group except it is not given the
manipulation that is hypothesized.
A control group could be a group of varied teenagers that did not drink milk and they could be
compared to the experimental group, a group of varied teenagers that did drink milk.
Thus, if the results of the experimental group differ from the control group, the difference must
be due to the hypothesized manipulation rather than some outside factor.
To test the first hypothesis, the student would find out if drinking milk affects height.
If drinking milk has no affect on height, then there must be another reason for the height of the
friend.
To test the second hypothesis, the student could check whether or not his friend has tall
parents.
Each hypothesis should be tested by carrying out appropriate experiments.
Be aware that rejecting one hypothesis does not determine whether or not the other
hypotheses can be accepted.
It simply eliminates one hypothesis that is not valid.
Using the scientific method, the hypotheses that are inconsistent with experimental data are
rejected.
While this "Tallness" example is based on observational results, other hypotheses and
experiments might have clearer controls.
A student might attend class on Monday and realize she had difficulty concentrating on the
lecture.
One hypothesis to explain this occurrence might be, "If I eat breakfast before class, then I am
better able to pay attention." The student could then design an experiment with a control to
test this hypothesis.
The scientific method may seem too rigid and structured.
Many times, science does not operate in a linear fashion.
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