Experimental Design

Question 1

Validity

Answer 1

Valid if every variable was kept controlled/constant apart from one IV and one DV

Question 2

Precision

Answer 2

How precise/close two measurements are to one another

Question 3

Accuracy

Answer 3

How close the measurement is to the desired/expected result

Question 4

IV vs DV

Answer 4

DV is affected and changed depending on the IV

• IV is variable being changed in experiment
• DV is what is being affected by the IV and is being measured in the experiment

Question 5

Controlled variables

Answer 5

Not the IV and DV: ever other variable must be kept constant/controlled in an experiment

Question 6

Random Errors

Answer 6

An unexpected error that can be improved with repetition and use of precise equipment

Question 7

Systematic Errors

Answer 7

An error that cannot be improved with repetition

Question 8

Reliability

Answer 8

How reliable data is - improved by repetition and large sample size

Question 9

Uncertainty

Answer 9

The idea that all data has a range of expected values, as opposed to a precise point value

Question 10

Sterilisation Methods

Answer 10

can be achieved through methods of heat, chemical, filtration, high pressure or irradiation treatments, to kill all life forms or biological agents

Question 11

Ethical Methods

Answer 11

Replacement of animal research with other research wherever possible
Reduction in the number of animals used in research
Refinement of experimental techniques to minimise pain and distress