Example 3

Caitlyn thinks that there may be a relationship between class size and student performance on standardized tests. She recorded the number of students in 20 classes, along with the average test score in each class, in the following table. Is there a linear relationship between class size and average test score? Use the correlation coefficient, [i]r[/i], to explain your answer.


Walch Education

Resource Type
coefficient  correlation  correlation-coefficient  data  graph  relationship  scatter-plot  table  table-of-values 
Target Group (Age)
14 – 18
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