________ first documented operant conditioning

Billy Bob is a participant in a study investigating the effectiveness of Ritalin in treating ADHD. Billy Bob has ADHD, but is in a group that received sugar pills instead of Ritalin. Billy Bob is in the __________ group

a) experimental b) random c) control d) observational

Which of the following provides a likely example of two positively correlated variables?

a) hours spent playing computer games and hours spent outdoors b) average daily temperature and number of people at the beach c) annual number of days missed from work and annual production bonus wages d) number of students an instructor has in a class and time spent with each individual