asked in category: General Last Updated: 7th March, 2020

# What does Z score mean?

Simply put, a z-score (also called a standard score) gives you an idea of how far from the mean a data point is. But more technically it's a measure of how many standard deviations below or above the population mean a raw score is. A z-score can be placed on a normal distribution curve.

Furthermore, how do you interpret z score?

A positive z-score indicates the raw score is higher than the mean average. For example, if a z-score is equal to +1, it is 1 standard deviation above the mean. A negative z-score reveals the raw score is below the mean average. For example, if a z-score is equal to -2, it is 2 standard deviations below the mean.

Beside above, what is a high z score? A high z -score means a very low probability of data above this z -score and a low z -score means a very low probability of data below this z -score..

Then, what is Z score used for?

Standard Score. The standard score (more commonly referred to as a z-score) is a very useful statistic because it (a) allows us to calculate the probability of a score occurring within our normal distribution and (b) enables us to compare two scores that are from different normal distributions.

Is a high z score good or bad?

A value higher than the mean has a positive Z-score, while a value lower than the mean has a negative Z-score. A value equal to the mean has a Z-score equal to zero. Z-scores also enable comparisons of data values across different distributions. Values of 100 in one distribution vs.

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7th March, 2020

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