Introduction to Econometrics 3rd Edition by James Stock, James Stock

Exercise 3

You are asked to study the casual effect of hours spent on employee training (measured in hours per worker per week) in a manufacturing plant on the productivity of its workers (output per worker per hour). Describe:
a. an ideal randomized controlled experiment to measure this causal effect;
b. an observational cross-sectional data set with which you could study this effect;
c. an observational time series data set for studying this effect; and
d. an observational panel data set for studying this effect.