A marketing research rm wants to know whether information presented in a commercial is better recalled when

Question:

A marketing research ﬁrm wants to know whether information presented in a commercial is better recalled when presented using humor or serious commentary by adults between 18 and 35 years of age. They will use an exam that asks questions of 50 subjects about information presented in the ad.
The response variable will be percentage of information recalled. Create a completely randomized design to answer the question. Be sure to include a diagram to illustrate your design.