Public Health Degrees. Public health programs focus on protecting and improving the health of communities. Students in these programs learn to conduct disease-related research and analyze the effects of genetics and the environment on an individual's health.
What is a 'Z-Score'. A Z-score is a numerical measurement of a value's relationship to the mean in a group of values. If a Z-score is 0, it represents the score is identical to the mean score. Z-scores may also be positive or negative, with a positive value indicating the score is above the mean and a negative score indicating it is below the mean. Positive and negative scores also reveal the number of standard deviations the score is either above or below the mean.
This is called standardizing the data. After converting, the mean of the z distribution would be 0 (because we subtracted the mean from every score) and the new standard deviation is 1. This makes sense if you think about it, because a score that was 1 standard deviation away from the mean has a z score of 1.