How does the Organization of the Petroleum Exporting Countries (OPEC) achieve its goal of stabilizing the worldwide price for oil

Whether or not a given study has the possibility of causing harm to participants:

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.

Anode is a point on a wave where there is no vibration. a.true b.false