Eight-month-old baby lucy picks up a toy in her crib and accidentally hits her crib with the toy, making an interesting noise. she begins to drag the toy back and forth against the sides of the crib's railing, producing another different and interesting sound. this prompts lucy to continue repeating the action over and over again. piaget would say that this is an example of

Dr. redbull conducts a study to determine whether her new energy drink children perform better on spelling tests. she randomly assigns children to one of two groups: group 1 receives her energy drink and group 2 receives water. she then gives both groups a spelling test and compares the results. which of the following is true about this study? a. group 1 is the dependent variable and group 2 is the independent variable. b. this is a correlational study. c. group 2 is the experimental group. d. the independent variable is the type of drink the children receive.