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Experimental design
Unit 3&4 VCE Biology
| Term | Definition |
|---|---|
| personal error | faults introduced as a result of the observer, includes mistakes |
| reproducibility | a measure of whether an experiment can be carried out in another laboratory or using different equipment & still get the same result |
| controlled variable | variable that is held constant throughout the investigation |
| primary data | data that has been measured/collected personally - first-hand |
| repeatability | a measure of whether an experiment can be repeated/ carried out by the same scientist and still get the same results |
| secondary data | data/information that has been collected by someone else - second-hand |
| control group | a group that does not receive any treatment, where the independent variable is absent |
| methodology | different techniques used to carry out an investigation |
| systematic error | error that affects the accuracy of a measurement; cause measured values to differ from true values by a consistent amount each time |
| independent variable | variable that is controlled by the experimenter, upon which another variable depends (what we change) |
| qualitative measurement | involves descriptive/non-numerical/catergorical results |
| dependent variable | variable that changes as a result of changes to the other variables, depends on other variable (what we measure) |
| outliers | readings that lie a long way from other results |
| hypothesis | an educated prediction, based on existing model/theory/knowledge, that can be tested |
| validity | whether experiment was affected by a single independent variable only & if the experiment measured what it was designed to measure |
| uncertainty | reflects the lack of exact knowledge of the value of the quantity being measured |
| precision | how closely two or more measurement values agree with each other, more precision |
| quantitative measurement | involves numerical results |
| aim | purpose of experiment: to … effect of (independent variable) on (dependant variable) |
| accuracy | measured value (result) obtained is close to the 'true' value of the measurement - minimal measurement error |
| random error | error that affects the precision of a measurement; unpredictable variations in measurement process and result in a spread of readings |
Created by:
BiologyBright
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