In June 2012, Time magazine ran an article titled “Do Family Dinners Really Reduce Teen Drug Use?” Answer the following questions in this context.
a. Identify the observational units.
b. Identify the explanatory and response variables.
c. Identify a confounding variable that provides an alternative explanation for the lower drug use among teens whose families ate dinner together, compared to those whose didn’t. Also, include a diagram showing how this explanation works.