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what are three ways to make skin analyzeran experiment more reliable?

i can only think of two, repeating the experiment and finding mean and comparing with others.
the experiment was uskin analyzer devicesing different concentrations of ethanol on onion skins.

Answer:
Maikang others would be:

better instrumentation
more accurate clock?
more accurate measurement ethanol concentration
ethanol concentration in water will change when exposed to air. control of that time.
more accurate measurements of ethanol used
more accurate measurements of onion skin quantity, size, thickness
better control over type of onion used
more accurate observations of results (Don’t know what this is, but it is relevant)skin analyzer

Maikang Reduce the factors affecting the results.skin analyzer


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