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what is not a correlation? what is it actually?
A correlation is not strictly a research method. It is an analysis tool as it makes use of statistics to test for a relationship between variables.
what are correlations used to assess? what are they called?
Correlations are used to assess the strength of a relationship between variables (called co-variables)
In a correlational study, there is … direct manipulation of variables
no
positive correlation
As one co-variable increases so does the other.
negative correlation
As one co-variable increases the other decreases
zero correalation
there is no relationship between the co-variables
A study may show a strong correlation, if
the variables are closely related = large correlation coefficient (between approx 0.7 and 1.0)
A study may show a weak correlation, if
the variables are only loosely related = small correlation coefficient (between 0.1 and approx 0.3)