Positive Z values indicate scores that are greater than the mean of the pooled sample, and negative values indicate scores that are less than the pooled mean.2. Z scores are similarly calculated for each patient for each of the remaining four cognitive tasks. This is done separately for the baseline and endpoint data. Stanine (standard nine) scores range from 1 to 9, with a mean of 5 and an SD of 2; sten (standard ten) scores range from 1 to 10, with a mean of 5.5 and an SD of 2. Stanine and sten scores are used in some psychological tests. IQ scores are also standardized; they have a mean of 100 and an SD of 15. Readers may note that Z transformation and Usually after the first few Ys, the variables become somewhat meaningless. The PCA score for any of the Xi is just it's coefficient in each of the Ys. In my earlier example, the score for X2 in the first principal component (Y1) is 1.76. The way PCA does this magic is by computing eigenvectors of the covariance matrix. The z-score is the standard deviation (SD) above or below the mean. A z-score of 0 is at the apex of the curve and is the same as a 50th percentile, a z-score of ± 1.0 plots at the 15th or 85th percentiles, respectively, and a z-score of ± 2 plots at roughly the 3rd or 97th percentiles. What does a z-score of 3.4 mean? Given a distribution with a mean of 60 and standard deviation of 98, find the z-score of 120.76. Given a distribution with a mean of 60 and standard deviation of 21, find a value with a z-score of 2.19. Find the z-score of 187.37, given a distribution with a mean of 185 and standard deviation of 1. srdmUA.

what does the z score represent