In article .com,
"ebd" wrote:

Fred,

Great job. This kind of work is very important. Someone earlier
suggested that unless you were to use a statistically valid sample you
couldn't draw any conclusions. Not true. Statistics is the last, if
even necessssary, step in a scientific proof. Observation, evaluation,
analysis, and preliminary experiments are the first steps.

Might I suggest you learn something about sample size and variation.
The variation is close enough, given the sample size, that this test
doesn't prove or disprove anything.

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