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.
Their cause is unknown but thought to be due to the contraction of the muscles covering the skull. Tension headaches usually occur because of physical or emotional stress placed on the body. Symptoms of a tension headache include pain which is described as âtightnessâ that begins in the back of the head and upper neck. It is usually mild in intensity, bilateral and not associated with vomiting or sensitivity to light. Usually, these headaches do not impair function.