# ISA Vocabulary

Prediction
This describes what you think will happen in an experiment
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Valid
The results and conclusions will be this if the variables are correctly controlled
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Fair Test
This is where only the independent variable is changed and the others controlled
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Hypothesis
A scientific statement that explains certain facts or observations
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Interval
This is the difference between the values of your independent variable
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Data
Informationor measurements that you collect
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Datum
One piece of information
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Systematic Error
This is an error that is always the same for each repeat- usually because of an arror in the equipment used
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Resolution
The smallest change that can be read from a measuring device for example a ruler measured in mm or cm
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Repeatable
If the same person can get the same reading using the same equipment and method
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Categoric Variable
A variable that can be described by a label or category such as colour or surface
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Control Variable
Variables that remain constant, to make sure that an investigation is valid
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Independent Variable
This is the variable that is changed during an investigation. There should be one of these
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Continous Variable
A variable which can have any numerical value
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Dependent Variable
This is the variable that changes as a result of a change in the independent variable
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Uncertainty
The range around a true value. For example 20cm +/-2cm
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Measurement Error
The difference between the real value and the measured value
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Anomaly
A result that does not fit the pattern
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Random Error
The error causes measurements to be spread around the true value- can be reduced be taking repeats and calculating a new mean
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Zero Error
When a piece of measuring equipment should be reading zero but it doesn't
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Accuracy
How close the reading is to the true value
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Precision
This is determined by the scale on the measuring apparatus e.g. a ruler marked mm is more precise than one cm
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Calibration
When we make sure that measuring apparatus is making correct readings e.g. the temperature of melting ice is 0 degrees celsius
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True Value
This is the real value of a measurement in an experiment
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Reproducible
If another person can get the same result using the same method and equipment or with different methods or equipment
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Range
The maximum and minimum values of the independent or dependent variables e.g. 'from 10cm to 50cm'
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## Other cards in this set

### Card 2

#### Front

The results and conclusions will be this if the variables are correctly controlled

Valid

### Card 3

#### Front

This is where only the independent variable is changed and the others controlled

### Card 4

#### Front

A scientific statement that explains certain facts or observations

### Card 5

#### Front

This is the difference between the values of your independent variable

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