If no correlation exists between the variables, the points appear randomly scattered on the coordinate plane. If a large correlation exists, the points concentrate near a straight line. Scatter plots are useful data visualization tools for illustrating a trend. If the vertical (or y-axis) variable increases as the horizontal (or x-axis) variable increases, the correlation is positive.
Whiplash Whiplash, a severe neck injury, can cause stiffness and pain in the neck, headache, dizziness, and more. Aortic stenosis Aortic stenosis is a condition of the heart causing shortness of breath, dizziness, or chest pain.
They are caused by muscle tension in the neck, shoulders and head. Problems in the neck, such as whiplash, or abnormalities of the spine, such as you have, can cause pain and tension in the neck, which in turn can cause headaches. Cluster headaches are defined as multiple recurrent attacks of severe, usually unilateral (one side of the head) pain.