<prompt> A standard z-score is related to:Binomial distributionNormal distributionChi-square testt-test  <response>: A z score is a statistic used to represent as to how many standard detion intervals a value falls above or below the mean. It is also known as standard normal scores. The z score is most commonly used in the context of population and the same principles are used for identification of location within the sample. z scores can be more and less than the mean and thus considered as positive and negative z scores. It is calculated as: z X - MSD where X One score in the example Sample, sign of the z score depends as to whether the sample value is above or below the mean. M Sample mean. SD Standard Detion of the sample. Ref: Statistics for the Behavioral Sciences By Frederick J. Gravetter, Larry B. Wallnau, Page 153-154; Encyclopaedia of Mathematics : In 6 Banden By Michiel Hazewinkel, Volume 1, Pages 397; Statistics for Evidence-Based Practice and Evaluation By Allen Rubin, Pages 86-90. 