Leyna finds that the number of hours she sleeps each night is related to the scores she receives on quizzes the next day. As her sleep approaches 8 hours, her quiz scores improve; as her sleep drops to 5 hours, her quiz scores show a similar decline. Leyna realizes that __________.
A) there is a negative correlation between the number of hours she sleeps and her quiz grades
B) there is a positive correlation between the number of hours she sleeps and her quiz grades
C) her low quiz scores are caused by sleep deprivation the night before a quiz
D) she should sleep about 10 hours a night to ensure 100 percent quiz grades

Question

Quizplus · Accepted Answer

The statement indicates that there is a positive correlation between the number of hours Leyna sleeps and her quiz scores. Therefore, as she sleeps more, her scores increase and vice versa. Option A is incorrect as it suggests a negative correlation, which is not presented in the statement. Option C is partially correct, but it only explains the cause of Leyna's low quiz scores, not her high ones. Option D is incorrect because there is no evidence to suggest that Leyna needs to sleep for 10 hours to improve her quiz scores.

Leyna Finds That the Number of Hours She Sleeps Each