Dear sir or madam, I was making an experiment and I have a small problem to write my final results. I�ve counted grain sizes in a metal sample using a specific software and I obtained the following data:
MEASURE 1
EX (average, expectation) = 3.6
D2X (variance, dispersion) = 22.3
S (standard deviation) = 4.7
S/EX (coefficient of variation) = 1.32
Xmin (minimum value) = 1.1
Xmax (maximum value) = 88.5
N (size of data set) = 4376
MEASURE 2
EX (average, expectation) = 4.3
D2X (variance, dispersion) = 18.3
S (standard deviation) = 4.3
S/EX (coefficient of variation) = 0.98
Xmin (minimum value) = 1.5
Xmax (maximum value) = 96.9
N (size of data set) = 4151
So, basically, I have three questions:
1) Usually I would have written (average +/- standard deviation) but the standard deviation is superior than my average ! How can I represent my final result or what should I say because I did several other measurements and they are quite the same?
2) Can I express my result as (average +/- coefficient of variation) ?
3) I need to represent this measures in one single number, so, how would I unite the two measurements ? Which formula should I use?
(mean average of MEASURE 1+ MEASURE 2) +/- (????)
Could you possibly help me with this problem? Thank you in advance and I hope to hearing from you soon.
Best regards,
maleck
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