exam😡 Flashcards
(611 cards)
investigation aim
is the purpose of the study
hypothesis template
it is hypothesised IV experimental group, lowered or increased the DV compared to IV control group
hypothesis example
it is hypothesised that children who consume sugar will have lowered level of attention compared with those who do not consume sugar
independant variable
the variable that is being manipulated by the researcher
(cause of the change)
dependant variable
result of the change
operationalising the iv and dv
involves defining how they will be manipulated or measured in the experiment
be specific
controlled experiment
is an investigation methodology that aims to test the effects of an IV snd DV, with all other variables controlled
extraneous variables
variables other then the independant variable that may have unwanted effect on the dependant variable and results
examples of extraneous variables
age, sex, personality
difference in temp, noise level light level
controlled variables
variables that are held constant to ensure that only influence on the dependant variable is the independant variable
example of controlled variable
in a study effecting caffeine on subjects time reaction to imaging, they should control the vision impairment, comfort levels and screen brightness bc these are potential extraneous variables
confounding variables
unwanted variables that affect the DV and the results in an investigation and it cannot be determined whether the IV or the confounding variable cause the change
population
a population of interest is 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
stratified sampling
is where the population is first divided into subgroups, and participants are randomly selected from each subgroup, in the proportion that they appear in the population
random sampling
involves selecting participants from the population in such a way that each member has an equal chance of being selected to participate in the study
strengths of random sampling
large enough random sampling likely to be representative of the population, improving external validity
limitations of random sampling
small random sampling may not be representative of the population, reducing external validity
what are the eight investigation methodologies
case study
classification and identification
controlled experiment
correlational study
fieldwork
literature review
modelling and simulation
product, process or system development
what occurs in controlled experiments
participants are randomly allocated to an experimental group and the results of the groups are then compared
what is the aim of a controlled experiment
to find whether an IV has an affect on the DV
what two groups are allocated in a control experiment
experimental group and control group
what is an experimental group (controlled experiment)
is exposed to the independant variable and receives experimental treatment
what is an control group (controlled experiment)
forms a baseline to compare with the experimental group. Members of the control group participate in the control conditions and are not exposed to the IV and do no receives experimental treatment