Cоnsidering the fоllоwing reseаrch study: Dr. Lodi is conducting а reseаrch study on the relationship between sleep and college grades. She recruits 100 college students for her study. To participate in the study, the students are provided with a smartwatch that they wear at night. The watch tracks how many hours they are asleep each night during the semester. At the end of the semester. Dr. Lodi obtains their final grades in courses. When analyzing the data, she notices that students who averaged 8 or more hours of sleep per night had higher final grades than students who averaged less than 7 hours of sleep per night. Which best describes the result of Dr. Lodi's study?