Please explain

We want to study the relationship between math and spelling capabilities. To do so, we recruit a random sample of seven middle schclcll students, and each student is given both a math and spelling test. Test at the .05 significance level wether there is a relationship between math and spelling capabilities. The scores are: mu m E I I5 13 1 s a 3 16 I4 4 1D 13 s 11 11 a a s 'l 12 10 What is the critical value of r? O .311 Q 354 O .666 O 3'06