Research Methods Flashcards
What is an aim?
a statement on what the investigator intends to investigate in the study
What is a hypothesis and what are the two types?
a clear statement on what the investigator expects to find.
directional hypothesis (states direction)
non-directional hypothesis (doesn’t states direction)
What are variables?
a thing that varies or stays the same in the investigation there are independent and dependent varaiables
Whats the difference between dependent and independent varaiables?
independent changes and dependent gets measured
What is operationalisation?
turning abstract concepts into measurable observations like social anxiety can not be observed but can be ranked.
What is an extraneous variable?
any variable different to the independent variable that may affect the dependent variable if we do not control it
What is a confounding variable?
any variable other than the independent variable that may have affected the dependent variable
What are demand characteristics?
any cue from the researcher or situation that causes the lead to the ppt interpreting the investigation and acting in certain ways or answering questions in a certain way or with certain reasons
What are investigator effects?
an unwanted unconscious or deliberate influence on the research outcome
What is randomisation?
it minimises the effect of extraneuos and confounding variables and controls the investigator effect
What is standardisation?
all particpiants are subjected to the same environment, information and experience
What is experimental design?
different in which testing participants can be organised in relation to experiemental conditions
What is independent group designs?
participants are allocated random groups where each group is an experimental condition
What are repeated measure?
all participants take part in all conditions of the experiment
What is matched pair design?
pairs of participants are matched on variables that may affect the dv then each person is assigned a group
What is random allocation?
attempt to control variables while randomly assigning conditions
What is counterbalancing
attempt to control effects of order in a repeated measures design.
What is strength of independent groups?
no order effects, ppts one in conditions. less likely to guess aim
What is strength of repeated measures?
good control of ppts variables, fewer ppts; less time consuming
What is strength of matched pairs?
reduced ppts variables: Ppts matched closely in each condition
avoids order and effects: boredom, fatigue and practice as only one condition so less likely to guess aim
What is weakness of independent groups?
abilities like memories - confounding variable
need more ppts than repeated measures
What is weakness of repeated measures?
order and practice effect: ppts may do better or worse on the 2nd test because of practice or boredom
ppts may guess aim
What is weakness of matched pairs?
time consuming
difficult to match ppts on key variables
impossible control all ppts variables
how do you deal with weaknesses in independent groups?
randomly allocate ppts distributes variables
how do you deal with weaknesses in repeated measures?
use 2 different tests to reduce practice effect
use counterbalancing - deals with order effect
cover story - avoids ppts guessing aim
how do you deal with weaknesses in matched pairs?
time consuming
never match perfectly
lose 2 subject s if one drops out
What is a lab experiment?
an experiment in a controlled environment allows manipulating of variables and controlling of extraneous variables
What is a field experiment?
an experiment taken in a natural setting researcher manipulates IV and records effect of DV
What is a natural experiment?
an experiment where the iV is not done by researcher but would have happened if researcher wasn’t there.
What is a Quasi-experiment?
almost an experiment, no identified IV, variables just exist, not an experiment
What are the strengths of a Quasi-experiment?
high control and comparisons can be made between people
What are the weaknesses of a Quasi-experiment?
ppts not randomly allocated
casual relationships not demonstrated
What are the strengths of a lab experiment?
Evs and Cvs can be controlled
can be replicated
What are the weaknesses of a lab experiment?
demand characteristics
may lack generalisability
What are the strengths of a field experiment?
natural environment
ppts unaware of being studied
What are the weaknesses of a field experiment?
ethical issues
more difficult to control Cvs and Evs
What are the strengths of a natural experiment?
greater external validity
only ethical option
What are the weaknesses of a natural experiment?
ppts not randomly allocated
natural event may occur
What is stratified sampling?
a type of sampling method in which the total population is divided into smaller groups or strata to complete the sampling process.
What is systematic sampling?
a probability sampling method where researchers select members of the population at a regular interval