"this constitution, and the laws of the united states which shall be made in pursuance thereof; and all treaties made, or which shall be made, under the authority of the united states, shall be the supreme law of the land…" the source of this quote is the article i powers of the constitution reserved powers of the constitution supremacy clause to the constitution tenth amendment to the constitution

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.