FSU conducted a survey and determined that there is a negati…

FSU conducted a survey and determined that there is a negative correlation between drinking alcohol and GPA. This report leads some people assume that alcohol is causing students to perform worse academically, but we cannot establish a causal relationship because:

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.