# Thread: how to calculate a z score

1. ## how to calculate a z score

hi,

well i have a question regarding a z-score calculation.

i have an array of values like this:

(23,45,32,12,65,34,67,22)

and a population of such arrays

(21,35,2,12,5,34,57,12)
(28,46,92,15,54,44,87,32)
(43,41,12,82,52,54,67,52)
(63,5,52,19,61,74,97,2)

to calculate a z score i would need to somehow derive a single number from my sample and a mean from my population. but the problem is i'm quite insecure in calculating an average from a single array like:

(23,45,32,12,65,34,67,22) -> avrg == mean =37.5

to get this single number and then doing the same thing for every single outcome in my population. is there an alternative??

how to calculate a z score for such a case ?

thank you!

ps

this is basically a type of vector manipulation that i'm not very familiar with ..

so what i want to do is to calculate a z-score for my experiment that has a set of outcomes compared to a population of experiments where every exper. in my population is consisted of also a set of outcomes

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