Anybody know about z scores?

Question

anonymous · Answer

http://www.youtube.com/watch?v=1xhCL5m4nI0

zarkon · Answer

I'm sure there are plenty of people here that know about z-scores.  Do you have a particular question?

anonymous · Answer

Can you have the same z score in the same set of data?  I'm thinking yes because what if you have the same number more than once but not sure

anonymous · Answer

If you know the mean and standard deviation, then you can plug them into 
$$z = (x - \mu)/\sigma,$$
wnere mu is the mean and sigma is the standard deviation.  Then the probability distribution in x becomes the standard normal distribution in z.

anonymous · Answer

If you are given a set of data, you can get their sample mean and sample variance, using the formula for a discrete set of data.

anonymous · Answer

If the number of data points is at least thiryt, then the normal approximation to distribution due to the data will be a good approximation.