Identify treatments and experimental units in the following scenarios.

a. City A would like to evaluate whether a new employment training program for the unemployed is more effective compared to the existing program. The City decides to run a pilot program for selected employment program applicants.

b. Marketing Agency B creates and places targeted advertisements on videosharing platforms for its clients. The Agency decides to run an experiment to compare the effectiveness of placing advertisements before vs. during vs. after videos.

c. Paul enjoys baking and finds a new recipe for chocolate chip cookies. Paul decides to test it by bringing cookies baked using his current recipe and the new recipe to his study group. Each member of the group blindly tastes each kind and provides their ratings.