Home > Statistics Every Writer Should Know > The Stats Board > Discusssion
z-factor
Message posted by Virginia (via 67.211.94.165) on February 18, 2002 at 12:59 PM (ET)
what exactly is the "z" factor and how does it help us understand standard deviation? P.S., I need to know this today (I have a large exam tomorrow)! THANKS
READERS RESPOND:
(In chronological order. Most recent at the bottom.)
Re: z-factor
Message posted by Darius (via 200.23.217.10) on February 18, 2002 at 3:23 PM (ET)
The ratio Z as the difference between the value and the mean divided by the SD.So Z gives the number of SD units that the value is from the mean.
Z = ( X - AVG) / SD or SD= (X - AVG)/Z
Re: z-factor
Message posted by JG (via 128.8.22.154) on February 18, 2002 at 7:57 PM (ET)
In order to use tables any normal distribution has to be transformed to a Z or standard normal distribution with mean 0 and SD=1 .
Your $5 contribution helps cover part the $500 annual cost of keeping this site online.
