Experimental design

Question 1

in terms of principles, what is formulation of a goal

Answer 1

a null hypothesis is created to test against

Question 2

in terms of the principles, what is comparison and control

Answer 2

keeping experimental conditions in check to ensure the desired IV is affecting the DV

Question 3

in terms of the principles, what is the replication of a study

Answer 3

when a study is replicable and multiple data sets can be collected allowing for stat analysis to be carried out

Question 4

in terms of the principles, what is randomisation

Answer 4

when sample is randomised to avoid bias

eg; points at which measurements are taken are randomly selected within an area

Question 5

in terms of the principles, what is stratification

Answer 5

when subjects within a sample are evenly distributed to maximise representation

Question 6

in terms of the principles, what is a factorial experiment

Answer 6

when multiple IVs are tested to have have an effect on a single DV

Question 7

what is the opposite of randomisation

Answer 7

Fixed sampling- when only one subject/specific niche of subject is used

Question 8

why are factorial experiments beneficial

Answer 8

there take less time to measure more variables

previously unthought of relationships can be discovered between variables

Question 9

define ‘blind trials’

Answer 9

when the subject does not know about the variables being tested on them- prevents bias confounding results

Question 10

define internal control of subject

Answer 10

the same subject is used for the control group and the test group- increases precision of result and prevents individual differences in subjects causing differing results