Use the Following Information for Questions

Short Answer

Use the following information for questions:
A group of 50 students each measured the length of their right arm and the length of their left arm. The right arm lengths were compared to the left arm lengths. The average difference between right and left arm lengths was 0.3 cm with a standard deviation of 1 cm.
-(Optional) Why do you think is the average difference between right and left arm lengths positive?