Which statement regarding the association shown could explain the relationship?
A newspaper collected information on schools in its
circulation area in order to compare their quality. Two
measures the newspaper collected for each school,
mean class size and mean score on a statewide
reading exam, are shown in the scatterplot.
O Class size appears to have little effect on test
scores
Comparing Schools
O Schools in more affluent areas have larger class
sizes which is associated with higher test scores.
O Schools in more affluent areas have smaller class
sizes, which is associated with higher test scores.
Schools in less affluent areas tend to have smaller
class sizes, which is associated with lower test
scores
90
80
70
Mean State Test Score
160
30
10 115 20 25
Mean Class Size Students