Definitions

Question 1

Precision

Answer 1

Precise measurements are ones in which there is very little spread from the mean value

Precision depends only on the extent of random errors and gives no indication of how close the results are to the true value

Question 2

Prediction

Answer 2

A prediction is a statement suggesting what will happen in the future, based off observation,experience or hypothesis

Question 3

Range

Answer 3

The maximum and minimum vales of the dependant or independent variables , it’s important in ensuring a pattern is detected

Question 4

Repeatable

Answer 4

A measurement is repeatable is the experimenter can repeat the investigation with the same method and equipment and obtain the same results

Question 5

Reproducible

Answer 5

A measurement is reproducible if another experimenter can do the repeat the same investigation with the same method and equipment and obtain the same result

Question 6

Resolution

Answer 6

This is the smallest change in the quantity being measured of a measuring instrument that gives a perceptible change

Question 7

Sketch Graph

Answer 7

A line graph , not necessarily a grid, that shows the general shape of the relationship between the two variables. It will not have any points plotted and although the axes may be labelled they’re not scaled

Question 8

True value

Answer 8

This is the value that would be obtained in an idea measurement

Question 9

Uncertainty

Answer 9

The interval in which the true value can be expected to lie, with a given level of confidence or probability

Question 10

Validity

Answer 10

Suitability of the investigative procedure to answer the question being asked.

Question 11

Valid conclusion

Answer 11

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

Question 12

Variables

Answer 12

These are physical, chemical, or biological quantities or characterises

Question 13

Categoric variable

Answer 13

Are variables that have labels such as name of a plant

Question 14

Continuous variables

Answer 14

Continuous variables can have values (called a quantity) that can be given a magnitude either by counting or by measurement

Question 15

Control variable

Answer 15

Control variables is one which may , in addition of the independent variable, affect the outcome of the investigation and therefore has to be kept constant

Question 16

Dependant

Answer 16

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

Question 17

Independant variable

Answer 17

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

Question 18

Interval

Answer 18

The quantity between readings for example 80cm3 split into interval of 10 cm3

Question 19

Accuracy

Answer 19

A measurement result is considered accurate if it is judged to be close to the true value

Question 20

Calibration

Answer 20

Marking a scale on a measuring instrument , this involves establishing the relationship between indications of a measure instrument and standard of reference quantity values , which must be applied

Question 21

Data

Answer 21

Information , either qualitative or quantitative , that had been collected

Question 22

Measurement errors

Answer 22

The difference between the measured value and the true value

Question 23

Anomalies

Answer 23

These are values in a set of results which are judged not to be part of the variation caused by random uncertainty

Question 24

Random error

Answer 24

The cause readings to be spread about the true value due to results varying in an unpredictable way from one measurement to and calculating a new mean

Question 25

Zero error

Answer 25

Any indication that a measuring system gives a false reading when the true value of a measure quantity is 0

Question 26

Evidence

Answer 26

Data which is shown to be valid

Question 27

Fair test

Answer 27

A fair test is one in which only the Independant variable has been allowed to affect the dependant variable

Question 28

Hypothesis

Answer 28

A proposal intended to explain certain facts or observations