###### Asked in Math and Arithmetic, Statistics, The Moon

Math and Arithmetic

Statistics

The Moon

# In statistics what shows how far away a measurement is from the mean or average of the set?

202122

## Answer

###### Wiki User

###### 04/20/2007

The "z-score" is derived by subtracting the population mean from the measurement and dividing by the population standard deviation. It measures how many standard deviations the measurement is above or below the mean. If the population mean and standard deviation are unknown the "t-distribution" can be used instead using the sample mean and sample deviation.

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