1B - Planning and conducting investigations (Part 1) Flashcards
Plan and conduct investigations
Population
the wider group of people that a study is investigating
Sample
the smaller group of people selected from the population who will be participants in the investigation
Sample size
should be representative of the population, meaning that the characteristics of people within the sample should represent those in the population,
Sampling techniques
involves procedures for selecting participants form the population
Random sampling
selecting participants from the population in a way that means each member of the population has an equal chance of being selected to participate in the study
Stratified sampling
first dividing the populations into subgroups and then randomly selecting participants from each subgroup in the proportion that they appear in the population
Convenience sampling
involves selecting readily available members of the population, rather than using a random or stratified approach
Allocation
dividing a sample into groups in an investigation
Random allocation
dividing a sample into groups in such a way that each participant has an equal chance of being placed into the experimental or the control group.
Experimental group
the group the is exposed to the independent variable and receives the experimental treatment
Control group
the group the forms a baseline level to compare the experimental group with.
Investigation designs
a framework that determines how participants experience the experimental and control conditions.
Between subject design
an investigation design in which participants are randomly allocated to either the experimental or control conditions.
Within subjects design
an investigation design in which all participants in the sample are involved in both the experimental and control conditions
Mixed design
an investigation design that combines elements of a between subjects design and a within subjects design
