A statistical measure of the association between two variables is called a
independent variable 

b. 
correlation coefficient 

c. 
dependent variable 

d. 
placebo 

e. 
control variable 
statistical measure of the association between two variables is known as correlation coefficient
independent variable or dependent variables are not correct answer because these are just variables, but not measure of association.
placebo is a condition which has no special treatment, so it is not measure of association
control variable is the variable which is controlled or kept under control during the experiment.
therefore, option B is correct answer
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