What is a Z-Score? The z-score describes how many standard deviations a raw score is above the mean. Negative z-scores indicate a position below the mean. For example, a z-score of 2 …

Z-scores describe how data values compare to the mean by indicating how many standard deviations a value falls above or below the mean.

Nov 25, 2025 · A standard deviation measures how spread out a data set is around its mean, while a z-score tells you how many standard deviations a specific data point is away from the …

Jul 12, 2025 · Z-scores are also known as standard scores because they standardize the value of a random variable. This means that the list of standardized scores has a mean of 0 and a …

Oct 6, 2023 · As the formula shows, the z-score is simply the raw score minus the population mean, divided by the population standard deviation. Figure 2. The Z-score formula in a …

In order to use a z-score, you need to know the mean μ and also the population standard deviation σ. Z-scores are a way to compare results to a “normal” population. Results from tests …

Jan 26, 2025 · What Is a Z-Score, Really? A Z-score tells you how many standard deviations away from the mean a specific value lies. Think of it as giving every piece of data a “relative …

Online z-score calculator: enter raw score, population mean and standard deviation to find how many standard deviations a value is from the mean. Instant and accurate results.

How do I calculate z-scores? You calculate the z-score by subtracting the mean from a data value and then dividing by the standard deviation. A z-score is a way to measure how far from the …

Feb 12, 2025 · A Z-score, also known as a standard score, measures how many standard deviations a data point is from the mean of a dataset. It is used in statistics to standardize …