EMPA

Question 0

Anomalous data

Answer 0

Measurements that fall outside the expected range.

Question 1

Accuracy

Answer 1

How close the measurement is to the true value.

Question 2

Causal link

Answer 2

A change in one variable causing a change in another variable.

Question 3

Confounding variable

Answer 3

This affects the result so must be monitored or kept constant.

Question 4

Control experiment

Answer 4

This eliminates the possibility that another factor has produced the results obtained.

Question 5

Positive correlation

Answer 5

A relationship that shows when one variable increases, the other variable increases.

Question 6

Negative correlation

Answer 6

A relationship that shows when one variable increases, the other variable decreases.

Question 7

Dependent variable

Answer 7

The variable that is measured when the independent variable changes.

Question 8

Independent variable

Answer 8

The variable that is deliberately changed in an investigation.

Question 9

Reliability

Answer 9

This is improved by carrying out repeat measurements.

Question 10

Mean

Answer 10

Adding repeat measurement up and dividing the total by the number of measurements.

Question 11

Range

Answer 11

The difference between the largest and smallest measurement.

Question 12

Standard deviation

Answer 12

The spread of data around the mean.

Question 13

Large sample size

Answer 13

This increases reliability as anomalous data can be identified.

Question 14

Random sampling

Answer 14

This eliminates bias as it is not subjective.

Question 15

Overlapping standard deviations

Answer 15

This indicates that any difference between two means is not significant.

Question 16

Errors

Answer 16

These cause readings to be different from the true value.