Four Air Force trainee pilots take a test of visual acuity (higher scores mean better acuity) and an anxiety test (higher scores mean more anxiety. The scores are as follows:

Person Acuity (x) Anxiety (y)

1 1 7

2 1 8

3 2 4

4 4 -1

Calculate critical value SP the correlation coefficient and determine whether the correlation is statistically significant at the .05 significance level, two-tailed