What is the value of Z equal to the mean?
2006-11-08 05:45:25 · 1 answers · asked by Heather N 2 in Education & Reference ➔ Homework Help
This is from memory so:
a z-score is the number of std deviations away from the mean. This allows you to compare data points from different populations as how many std-dev they are away from the mean.
Therefore the z-score at the mean = 0.
z-score one std deviation away = 1.
From wiki:
"In statistics, a standard score (also called z-score or normal score) is a dimensionless quantity derived by subtracting the population mean from an individual (raw) score and then dividing the difference by the population standard deviation.
The z score reveals how many units a case is above or below the mean. The z score allows us to compare the results of different normal distributions, something done with frequent research."
2006-11-08 06:10:30 · answer #1 · answered by Will 4 · 0⤊ 0⤋