Dr. Zoidberg believes his experiment’s results provide stron…

Dr. Zoidberg believes his experiment’s results provide strong evidence that people’s moods can be improved if they are shown Futurama cartoons.  However, these effects do not appear to be long lasting, as they can only be produced in the lab.  Dr. Zoidberg’s experiment can best be described as having good ___________ validity, but poor ___________ validity.