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In Reply to: RE: If you cannot even answer posted by Ryelands on July 12, 2016 at 13:10:34:
Anyone who can not understand the reason behind my question is categorically unqualified to reach any conclusion from using Diffmaker or any other numeric based tools to conduct any physically based experiments.I learned as much in high school physics labs. Repeat the same experiment and you will get different results each time. These are caused by random noise or other things that are not understood. If comparing different test conditions are not hugely different from comparing the same test conditions multiple times, then noise or other defects in the experimental test setup will make it impossible to reach any valid conclusions.
In general, even if you do dozens of tests with condition A and dozens with condition B and there is nothing close to an overlap of data points between the two tests, you still do not know for sure that this is because the two conditions are really different, unless you have blinded your test apparatus from the two test conditions. So, for example, if you run all the multiple tests on condition A first and then run all the multiple tests on condition B second, even if all the results are -90 dB +-1 dB for condition A and all the results are -100 dB +- dB for condition B you still can not reach a valid conclusion that the choice of A or B affected the result, because it could be that something else in your system or environment had changed between when you did the testing of condition A and the testing of condition B. (For example, a neighbor might have switched off a noisy electrical appliance.)
I am not going to waste any more time explaining this. It is either crystal clear, or people need to seriously rethink their understanding of scientific experiments. A final point: anyone who uses any experimental apparatus without a complete understanding of how it works and what its limitations are is a fool. This was another lesson from my high school physical lab work. We used an electric stop watch to time a pendulum so as to measure the acceleration of gravity. My lab partner and I got inconsistent results (and incorrect results) because it turned out that we were actually using the pendulum to measure the power line frequency. We went with the instructor to the local power company and looked at their charts of power frequency and saw that it varied by several percent around the nominal 60 Hz frequency, mostly as a result of varying load over different times of day. We were able to correlate our raw experimental data with the power company data, and ended up with a grade of A+ on the final result.
Years later, my cynicism came to the fore, when I realized that many of the other students could not possibly have gotten the correct results, and therefore they were probably cheating. With the benefit of hindsight, there would probably have been lab data to prove that these kids had been cheaters and back then (late 1950's and early 1960's) they might even have been thrown out of school. Now, I have little confidence in any "scientific data" since most "scientists" today are as biased by getting good funding grants as school kids were to get good grades. This covers "climate science" and big pharma's "science".
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
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Follow Ups
- RE: If you cannot even answer - Tony Lauck 07/12/1617:11:08 07/12/16 (1)
- A post of wisdom and experience - rickmcinnis@dogwoodfabrics.com 08:13:44 07/13/16 (0)
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