Kiran collects data about the number of trees on school property and the average standardized test scores for those schools. Kiran
says, "The scatter plot between the number of trees on a school
property and student standardized tests scores shows a strong and
positive correlation. An increase in the number of trees on school
property causes the students to score better on standardized tests."
What does it mean for the relationship between the variables when
the correlation is positive in this situation?