Based on the provided data for Joslyn Smith and Heather Miller, it appears that as the years of higher education increase, the current salary also increases.
- Joslyn Smith: 6 years of higher education, $81,500 salary
- Heather Miller: 2 years of higher education, $38,000 salary
This suggests a positive correlation between years of higher education and current salary.
Therefore, the correct answer is: a positive correlation.