ISA

Question 1

Accuracy

Answer 1

An accurate measurement is one which is close to the true value

Question 2

Anomalous data

Answer 2

those measurements that fall outside the normal, or expected, range of measured values.

Question 3

Calibration

Answer 3

equipment is set to 0 or no air bubbles

Question 4

causal link

Answer 4

certain one variable that has had an effect on the other

Question 5

confounding variable

Answer 5

control variable

Question 6

control experiment

Answer 6

set up to eliminate certain possibilities.

Independent variable is changed and all confounding variables are kept the same

Question 7

controlled group

Answer 7

allows scientists to make comparisons

Question 8

dependent variable

Answer 8

the value that measures the independent variable

Question 9

double blind trial

Answer 9

neither patients or scientists know which individual is receiving

Question 10

Fair test

Answer 10

only the independent variable has been allowed to affect the dependent variable.
can usually be achieved by keeping all other variables constant or controlled.

Question 11

Precision

Answer 11

smaller scale is more precise,

very little spread about the mean value

Question 12

protocol

Answer 12

method that has been tested and works

Question 13

random distribution

Answer 13

result of chance, data will be valid if they have been collected randomly

Question 14

Random errors

Answer 14

occur in an unpredictable way.

may be cause by a human error, faulty technique in taking in measurements, or by faulty equipment

Question 15

Raw data

Answer 15

instrument readings (primary data)

Question 16

reliability

Answer 16

repeatable

Question 17

systematic errors

Answer 17

occur when using wrong callrated instrument

Question 18

validity

Answer 18

only valid if measurements that have been made are affected by a single independent variable only
control variables aren’t allowed to change

Question 19

zero errors

Answer 19

cause by instruments that have an incorrect zero