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Flashcards in How science works Deck (18)
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1

Accuracy

How close it is to the true value

2

Precision

When the repeated measurements are similar

3

Repeatability

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

4

Reproducibility

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.

5

Anomalies

Values in results that are not part of variation caused by random uncertainty

6

Random errors

These cause readings to be spread about the true value, due to results varying in an unpredictable way from one measurement to the next.

7

Zero error

Any indication that a measuring system gives a false reading when the true value of a measured quantity is zero, e.g. the needle on an ammeter failing to return to zero when no current flows.

8

Control variable

A control variable is one which may, in addition to the independent variable, affect the outcome of the investigation and therefore has to be kept constant or at least monitored

9

Independent variable

the variable for which values are changed or selected by the investigator

10

Dependent variable

the variable of which the value is measured for each and every change in the independent variable

11

Systematic error

Measurement error that is constant or follows a pattern

12

Uncertainty

The interval within which the true value can be expected to lie

13

Measurement error

The difference between a measured value and the true value

14

Random error

Measurement error due to unpredictable variation from one reading to the next

15

Fair test

Where the only thing affecting your dependent variable is your independent variable

16

Continuous data

Data that can have a value anywhere on a continuum between two extremes

17

Discontinuous data

Data that fits into a number of distinct classes or categories

18

Validity

How useful your evidence is to actually answer the question