# ISA Terminology

?
Interval
The quantity between readings e.g a set of 11 readings equally spaced over a distance of 1 metre would give an interval of 10 centimetres.
1 of 29
Precision
Precise mesurements are ones in which there is very little spread about the mean value. Precision depends only on the extent of random errors not how close the value is to the true value.
2 of 29
Prediction
Statement suggesting what will happen in the future based on observation, experience or hypothesis
3 of 29
Range
Maximum and Minimum values of the independent and dependent variables
4 of 29
Repeatable
A measurement is repeatable if the original experimenter repeats the investigation using the same method and equipment and obtains the same results
5 of 29
Reproducible
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
6 of 29
Resolution
This is the smallest change in the quantity being measured (input) of a measuring instrument that gives a perceptible change in the reading.
7 of 29
Sketch Graph
A line graph that shows the general shape of the relationship between the two variables, It will not have any points or scaled axis but will still have labelled axis.
8 of 29
True Value
The value that would be obtained in an ideal measurement
9 of 29
Uncertainty
The interval within which the true value can be expected to lie with a given level of confidence or probability
10 of 29
Validity
11 of 29
Valid Conclusion
A Conclusion supported by valid data, supported by valid data obtained from an appropriate experimental design and based on sound reasoning
12 of 29
Variables
Physical chemical or biological quantities or characteristics
13 of 29
Catergoric Variables
Catergoric variables have values that are labels.
14 of 29
Continuous Variables
Can have values that can be given a magnitude either by counting or by measurement
15 of 29
Control Variables
may affect the outcome and has to be kept constant or monitored
16 of 29
Dependent Variable
Value measured for each change in the independent variable
17 of 29
Independent Variable
Values changed or selected by the investigator.
18 of 29
Accuracy
Judged to be close to the true value
19 of 29
Calibration
Marking a scale on a measuring instrument
20 of 29
Data
Information that has been collected
21 of 29
Measurement Error
The difference between a measured value and a true value
22 of 29
Anomalies
These are values in a set of results which are judged not to be part of the variation caused by random uncertainty
23 of 29
Random Error
The cause readings to be spread about the true value due to results varying in an unpredictable way from one measurement to the next. The effect of random errors can be reduced by be reduced by making more measurements and calculating a new mean
24 of 29
Systematic Error
These cause reading to differ from the true value by a consistent amount each time a measurement to made. Cant be dealt with using repeats.
25 of 29
Zero Error
If a measuring instrument isn't returned to zero
26 of 29
Evidence
Valid Data
27 of 29
Fair Test
Only the independent variable is allowed to affect the dependent variable
28 of 29
Hypothesis
A proposal intended to explain certain facts or observations
29 of 29

## Other cards in this set

### Card 2

#### Front

Precise mesurements are ones in which there is very little spread about the mean value. Precision depends only on the extent of random errors not how close the value is to the true value.

Precision

### Card 3

#### Front

Statement suggesting what will happen in the future based on observation, experience or hypothesis

### Card 4

#### Front

Maximum and Minimum values of the independent and dependent variables

### Card 5

#### Front

A measurement is repeatable if the original experimenter repeats the investigation using the same method and equipment and obtains the same results