Dr. sullivan is conducting a clinical trial to determine if vitamin xx can improve test performance of students in an introductory college nutrition course. dr. sullivan puts all the students' names in a hat and draws names to determine if they will be placed in the control or the experimental group. the experimental group receives a capsule of vitamin xx and the control group a "sugar pill" that tastes and looks identical to the vitamin xx capsule. neither dr. sullivan nor the participants know who is receiving which treatment. this experiment is best described as

Which bronfenbrenner level examines the developmental influences of homes, caregivers, friends, and teachers?

What makes water a renewable source

Aplaintiff filed a civil action based on negligence against a defendant in federal district court, alleging that the defendant negligently ran a red light at an intersection and collided with the plaintiff's vehicle, causing the plaintiff's injuries. a week after the close of discovery, the plaintiff filed a motion for summary judgment on the issue of whether the defendant was negligent. with the motion, the plaintiff filed (i) his own sworn affidavit, which stated that the traffic signal was green as he entered the intersection, (ii) an affidavit of a witness who was driving the car behind him, which stated that the witness saw the entire incident and that the plaintiff's traffic signal was green as he approached and entered the intersection; and (iii) an affidavit of another witness, which stated that she saw the entire incident and that the defendant's signal had been red for several seconds before the defendant entered the intersection and was still red when the defendant entered the intersection. the defendant filed a response to the motion, noting that her answer denied negligence and further denied that her traffic signal was red, and argued that the issue of negligence and the issue of whether her traffic signal was red were in dispute, so those issues should be tried to a jury. how should the court rule on the plaintiff's motion?