Flashcards
Experimental Design
Flashcards do conjunto (13)
- 1Hypothesis"testable" statement that connects I.V. and D.V.
- 2Independent Variabledeliberately changed; plotted on x-axis
- 3Dependent Variablemeasured variable; plotted on y-axis
- 4Random Errorscaused by any factor that randomly effects the measurements of the I.V.
ie. human errors - 5Identification of Random Errors:amount of scatter can reflect amount of random errors.
HIGH scatter = HIGH R.E.
LOW scatter = LOW R.E. - 6REDUCTION of Random Errors:increase in sample size allows averages to be calculated so the EFFECT of random errors can be MINIMISED.
- 7ELIMINATION of Random Errors:measurements CANNOT be perfect so R.E. can't be eliminated
- 8Precision: (only for random errors)(only for random errors)
how well random errors are minimised.
HIGH scatter {HIGH R.E}. = LOW PRECISION
LOW scatter {LOW R.E.} = HIGH PRECISION - 9Systematic Errorspresent when measured values differ CONSISTENTLY from the TRUE VALUE
ie. faulty equipment, incorrect calibrations and experimental design - 10Identification of Random Errors:g
- 11REDUCTION of Random Errors:h
- 12Accuracy (only for systematic errors)how close the results are to the TRUE VALUE
- 13Experimental results can only be:SUPPORTED or REFUTED
{not proved}
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- SACE Biology FlashCards sobre Experimental Design, criado por R P em 16-11-2014.
- Criado por
- R P
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