It is not so anymore, psychologists are taught to design experiments showing that changes in an independent variable correlate with a dependent variable. I'm not sure when the change came, but I'd guess that in 1970s it was so already.
It is not so anymore, psychologists are taught to design experiments showing that changes in an independent variable correlate with a dependent variable. I'm not sure when the change came, but I'd guess that in 1970s it was so already.