Thursday, August 19, 2010

Measurement Readings (Cont.) and Error (Systematic vs. Random)

We started the day by reporting the mass values measured the day before on the 4-beam balance. Part of the discussion dealt with systematic error (when an error occurs over and over consistently) and random error (an infrequent, singular event). Example, the fact that the 4-beam balance does not zero is a systematic error. It is consistent as long as you use the same scale, that is why I insisted that you go back to the same lab area that you used the day before so you used the same scale. You kept the systematic error the same because of it. Your data MAY be slightly inaccurate, but you are consistent. If you had changed scales, you would be introducing random error. You values would vary due to different reasons (in this case a different scale). Therefore, there would be no consistency in error and you could not factor out the error because it would be constantly changing, thus a different fix would be needed each time.

Please finish the graduated cylinder (volume) readings and thermometer readings (temperature) on the packet for tomorrow.

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