A measurement result is considered accurate if it is judged to be close to the true value.
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Precision
Precise measurements are ones in which there is very little spread about the mean value. Precision depends only on the extent of random errors - it gives no indication of how close results are to the true value.
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Anomalies
Anomalies are values in a set of results which are judged not to be part of the variation caused by a random uncertainty.
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Evidence
Data which has shown to be valid
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Fair Test
A test in which only the independent variable has been allowed to affect the dependent variable.
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Hypothesis
A proposal intended to explain certain facts or observations.
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Prediction
A statement suggesting what will happen in the future, based on observation, experience or a hypothesis
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Range
Maximum and minimum values of the independent or dependent values.
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Repeatable
A measurement is repeatable if the original experimenter repeats the investigation using same method and equipment and obtains the same results.
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Reproducable
A measurement is reproducible if the investigation is repeated by another person, or by using different equipment or techniques, and the same results are obtained.
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Independent Variables
Values are changed or selected.
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Dependent Variables
Value is measured for each and every change in the independent variable.
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Control Variables
May affect the outcome of the investigation and therefore has to be kept constant or monitored.
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Flammable
Flammable if exposed to ignition sources e.g. sparks, heat. Some substances may give off flammable gases in contact with water.
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Harmful/Irritant
May cause irritation (redness, rash) or less serious toxicity.
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Environmental Hazard
Toxic to aquatic organisms and may cause long lasting effects in the environment.
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Carcinogen
May cause serious and prolonged health effects on short or long term exposure.
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Gas Under Pressure
Contains gas under pressure. Gas released may be very cold. Gas container may explode if heated.
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Corrosive
Corrosive material which may cause skin burns and permanent eye damage.
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Explosive
May explode if exposed to fire, heat, shock.
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Oxidising
Can burn even without air, or can intensify fire in combustible materials.
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Toxic
Toxic material which may cause life threatening effects even in small amounts and with short exposure.
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Other cards in this set
Card 2
Front
Precise measurements are ones in which there is very little spread about the mean value. Precision depends only on the extent of random errors - it gives no indication of how close results are to the true value.
Back
Precision
Card 3
Front
Anomalies are values in a set of results which are judged not to be part of the variation caused by a random uncertainty.
Back
Card 4
Front
Data which has shown to be valid
Back
Card 5
Front
A test in which only the independent variable has been allowed to affect the dependent variable.
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