Stats Day1

With Spring day 1 I start regular intro statistics study:

My notes from day 1:
Standard Error of Mean (SD of a sample):
SD/ root(n)  - the larger sample size, the error decreases,


Z-Score: (x-mean)/SD
https://en.wikipedia.org/wiki/Standard_score

T-Score:
Conversion Score = z * (NewSD)+NewMean
NewSD for T-Score = 10 and NewMean = 50
T-Score = Z-Score*10+50
More: Essentials of Testing and Assessment: A Practical Guide for Counselors ...Autorzy Edward S. Neukrug,R. Charles Fawcett p 133 (fragment available online via Google)


Coefficient of Variation
CV% = (SD/Mean)*100