An article in usa today† describes a study of how young children learn. sixty-four 18-month-old toddlers participated in the study. the toddlers were allowed to play in a lab equipped with toys, which also had a robot hidden behind a screen. the article states: "after allowing the infants play time, the team removed the screen and let the children see the robot. in some tests, an adult talked to the robot and played with it. in others the adult ignored the robot. after the adult left the room, the robot beeped and then turned its head to look at a toy to the side of the infant. in cases where the adult had played with the robot, the infant was four times more likely to follow the robot's gaze to the toy." indicate whether the study is an observational study or an experiment. give a brief explanation for your choice. (hint: see examples 1.2 and 1.3.) this is an observational study because the researchers observed how all the toddlers acted under the same conditions. this is an observational study because the researchers examined the toddlers observing adults and robots. this is an experiment because the researchers were using technological equipment, like robots. this is an experiment because the researchers assigned the toddlers to different experimental treatments.