Select the correct answer. In which research method does a researcher change the value of one variable to determine how the change affects another variable

Acharge nurse is observing a newly licensed nurse provide care to a group of clients. which of the following actions by the newly licensed nurse requires an incident report by the charge nurse? a. a client who has a lithium level of 1.8 meq/l receives her morning dose of lithium. b. the nurse administers ondansetron to a client who has two episodes of vomiting after receiving meperidine 75 mg im. c. the nurse requests a higher dose of morphine for a client who reports severe pain 30 min after receiving morphine 2 mg iv bolus. d. a client who has a blood glucose level of 120 mg/dl receives her morning dose of insulin.