Study of the effects of exercise used rats bred to have high or low capacity for exercise. There were 8 high-capacity and 8 low-capacity rats. The 8 high-capacity rats had mean blood pressure 89 with standard deviation 9, and the 8 low-capacity rats had mean blood pressure 105 with standard deviation 13. Using table C of your textbook (without additional software) what is the margin of error for a 95% confidence interval for the difference of the two means (low capacity - high capacity)? (Answer to the nearest hundredth.)