Week 2 Flashcards
Research Methods
Variables
anything that varies can be a variable
qualitative variable
what kind (hair color, nationality, major)
Quantitative Variable
age, height, score
Reliability
the consistency of the measurement
test-retest reliabilty
same result on 2 different occasions
inter-test reliability
2 raters agree
validity
the extent to which the measure measures what it is supposed to measurent
normal distribution
bell curve
central tendency
peak of bell curve
variability
length of the bell curve
mean
sum of scores/total number of scores (average)
median
middle score
mode
most common score
difference between means
size of the effect
(Mean 1 - Mean 2)/SD
naturalistic observation
observe without interfering
Case study
intensive examination of behavior and mental processes in an unusual individual
surveys
have people complete questinoaires
sampling
who is included in your study
population
the entire group you are interested in
sample
the people in you study
random sample
every member of the population has an equal change of being in the sample
correlational design
a research design that investigates the association between tow variable
- refers to the statistical relationship between two quantitative variable
r = 0
no relationship
r = 1
perfect relationship
positive r values
mean the 2 variables covary in the same direction
negative r
2 variables covary in opposite directions
words describing correlation
is associated with
is related to
covaries with
predicts
is more likely
experimental group
receives the treatment
control group
does not receive the treatment
independent variable
what research manipulates
dependent variable
what the researcher observes
confound
any difference between the experimental and control groups other than the independent variable
experimenter expectations
can influence the outcome of a study even if the experimenter doesn’t intend
placebo effect
improvement from expectation of improvement
participant demand
participants try to behave in the way they believe the experimenter wants them to behave
double blind design
neither the participant nor the experimenter knows which condition the participants are in
quasi-experiment
study differences between existing groups