Key Words

Question 1

Zero error

Answer 1

Any indication that a measuring system gives a false reading when the true value of a measured quantity is zero

Question 2

Evidence

Answer 2

Data which has been shown to be valid

Question 3

Fair test

Answer 3

A fair test is one in which only the independent variable has been allowed to affect the dependent variable

Question 4

Hypothesis

Answer 4

A proposal intended to explain certain facts or observations.

Question 5

Interval

Answer 5

The quantity between readings eg a set of 11 readings equally spaced over a distance of 1 meter would give an interval of 10 centimetres

Question 6

Precision

Answer 6

There is very little spread about the mean value. Precision depends on only the extent pf random errors

Question 7

Prediction

Answer 7

A statement suggesting what will happen in the future based on observation experience or a hypothesis

Question 8

Range

Answer 8

The maximum and minimum values of the independent or dependent variables

Question 9

Repeatable

Answer 9

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

Question 10

Reproducable

Answer 10

The investigation is repeated by another person or by using different equipment or techniques and the same results are obtained

Question 11

Resolution

Answer 11

The smallest change in the quantity being measured

Question 12

Sketch graph

Answer 12

A line graph that shows the shape of a graph but the axis should be labelled

Question 13

True value

Answer 13

The value that would be obtained in an ideal measurement

Question 14

Uncertainty

Answer 14

The interval which the true value can be expected to lied by

Question 15

Validity

Answer 15

The procedure of answering a question being asked

Question 16

Valid conclusion

Answer 16

A conclusion supported by valid data obtained from an appropriate experimental design and based on sound reasoning

Question 17

Variables

Answer 17

The physical chemical or biological quantities or characteristics

Question 18

Categoric

Answer 18

Have values that are labels eg names of plants

Question 19

Continuous

Answer 19

Can have values that can be given a magnitude either by continuing or by measurement

Question 20

Control

Answer 20

Control Variable is one which may in addition to the independent variable, affect the outcome of the investigation having to be kept constant

Question 21

Dependent

Answer 21

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

Question 22

Independent

Answer 22

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