In an introductory statistics class, a professor asked each of his 39 students to rate the attractiveness of the instructor (x) and predict the grade they expect to receive in the course (y). The correlation between x and y was .36. Therefore, the approximate 95% confidence interval around r is ______.
[.05, .61]
[.05, .71]
[.55, 61]
[.55, .71]
