Z Score Calculation Using Data Points
Enter the values below. The Z Score value will be automatically calculated and displayed.
Essentially this is how you can express the above computation :
Z Score Calculation Using Sample Mean and Size
Enter the values below. The Z Score value will be automatically calculated and displayed.
Essentially this is how you can express the above computation :
Z Score Calculation
The z-score is the number of standard deviations a data point is from the population mean. You can calculate a z-score for any raw data value on a normal distribution.
When you calculate a z-score you are converting a raw data value to a standardized score on a standardized normal distribution. The z-score allows you to compare data from different samples because z-scores are in terms of standard deviations.
A positive z-score means the data value is higher than average. A negative z-score means it's lower than average.
You can also determine the percentage of the population that lies above or below any z-score using a z-score table.