UNIT 1 EXAM Flashcards
define independent variable
is deliberately manipulated by experimenter
define dependant variable
what is being measured in the experiment. its value relies on the IV
define operationalisation
the variable is stated in terms that show how its measured (age in total months, the number of aggressive responses in an observed 30 minute period)
define extraneous variable
a variable other than the IV that causes change to the DV
define confounding variable
an EV that invalidates the results
define population
group we wish to draw conclusions from
define sample
smaller number of individuals from the population
state the types of participant selection
random sampling, stratified sampling, convenience sampling
define random sampling
every member of population has equal chance of selection
define stratified sampling
ensuring that the random sample represents the diversity of the population
define convenience sampling
participants are chosen to easier accessibility
define experimental group
receives the IV. purpose is to show the. effects of the IV on the value of the DV
define control group
aren’t exposed to IV. purpose is to form a basis for comparison to experimental group
state the experimental designs
repeated measures, matched participants, independent groups
define repeated measures
each participant is member of control group and experimental group
define matched participants
researcher identifies a variable that is a likely confound and eliminates the effects of this variable
define independent group
allocates participants to the control group or experimental group at random
define qualitative data
descriptions of characteristics (emotional state)
define quantitative data
data value takes numerical form and refers to measurement
state the types of data collection
observation, interview, questionnaires, psychological tests, cross sectional studies, technology in data collection, longitudinal studies
define the absolute threshold
the minimum amount of stimulus energy needed for an observer to perceive a stimulus, in ideal conditions 50% of the time
state the 5 tastes
umami, salty, sweet, sour, bitter
define perceptual constancies
enable us to maintain a stable perception of a stimulus, although its image on the retina may change
define size constancy
we maintain a constant perception of an objects size even though the size of the image on the retina changes
define shape constancy
an object is perceived to maintain its known shape despite the changing perspective from which it is viewed
state the gestalt principles
figure ground, phi phenomenon, similarity, proximity, closure, camouflage
define figure ground
seeing lines and associating It with an image we have previously seen
define phi phenomenon
associating cartoon or drawn shapes with things that look similar