The scatter plot shows the relationship between the test scores of a group of students and the number of hours they spend on social media in a week:
A scatter plot is shown. The x-axis is labeled Hours spent on social media, and the y-axis is labeled test score. Data points are located at 0.5 and 100, 2 and 100, 1 and 95, 3 and 85, 3 and 78, 5 and 75, 5 and 72, 6 and 70, 6 and 98, 7 and 60. A circle labeled A includes all of the points except for the one at 6 and 98. Point 6 and 98 is labled B.
Part A: What is the group of points labeled A called? What is the point labeled B called? Give a possible reason for the presence of point B. (3 points)
Part B: Describe the association between a student's test scores and the number of hours spent on social media. (2 points)
Part A: The group of points labeled A is called a cluster. The point labeled B is an outlier. One possible reason for the presence of point B could be that the student who scored 98 on the test despite spending 6 hours on social media may have unique study habits, exceptional intelligence, or other factors that positively impacted their test performance.
Part B: The association between a student's test scores and the number of hours spent on social media appears to be negative. As the number of hours spent on social media increases, test scores tend to decrease. This suggests that excessive use of social media may have a detrimental impact on a student's academic performance.