By convention, specific symbols represent certain sample statistics. For example, 1  x refers to a sample mean. 2  s refers to the standard deviation of a sample. 3  s 2 refers to the variance of a sample. 4  p refers to the proportion of sample elements that have a particular attribute.or example, 1  P refers to a population proportion; and p, to a sample proportion. 2  X refers to a set of population elements; and x, to a set of sample elements. 3  N refers to population size; and n, to sample size.
The brain is one of the most important organs in the body and gives humans the capacity for language, art, and rational thought. A brain surgeon, or neurosurgeon, is a doctor that performs surgery on the nervous system, particularly the brain. He or she will also treat a wide range of problems affecting the central nervous system is the job of a brain surgeon.
A neurosurgeon is a medical specialist who treats diseases and conditions affecting the nervous system, which includes the brain, the spine and spinal cord, and the peripheral nerves. In the medical field, neurosurgeons are one of the highest paid and most specialized of doctors. Neurosurgery often attracts some of the best and the brightest of the medical field, due to the extremely challenging and dynamic nature of the field. 1  If you are interested in becoming a doctor specializing in neurological surgery, you have a long road ahead.