A z score is the distance from the population mean in units of the population
http://www.chacha.com/question/whatistheztest...

The zscore, for a value z, is the probability that a Standard Normal random variable will have a value greater than z.
http://wiki.answers.com/Q/What_is_measured_by_the_...

1. Height is a continuous variable. Describe your data with statistics such as the mean, mode, median and range. Use the mean and the standard deviation if your data is continuous
http://www.ehow.com/how_8553665_choosestatistical...
