correlation design Flashcards
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correlation design
a type of non-experiment
draw a sample,then measure 2 or more different variable
-see how well they hang together
-how they are related
example facebook
positive linear
up
negative linear
Down
no linear relationship
correlation (r)
a statistic that indexes the degree of relationship between two variables
-+/- = direction of relationship (posit or negative)
- Numbers= strenght of the relationship
(how close is one variable associated with the other one)
linear relationship can be summirized by a single number
r = correlations
r can range from -1 to +1
- -1=perfect negative linear relationship
- +1= perfect positive linear relationship
- 0=no relationship
the closer to the number -1 or +1 more correlation it has
correlation does not equal causation!!!!
ex
third variables vs confound varible
third varible - that causes that correlation to happen
confound variable-the problem is in the defenition of how to mesure the interest
when can we say different varible a cause of change virable
in experimental design
experimental method
it involves manipulation of one variable,controls of several other variables and then measure the outcome variable (DV)
experimental design
A must happen before B
when A is present, B must follow
when A is absent, B should not follow
when Ais the only thing change that might affect B
basic experiment design
1.sample(random assigment)
condition 1 (independable variable) condition 2= dependable varibles
independent variable
cause
is independent of the participants / is controled by the reserchers
dependent variable
effect/responde
is dependent of participants