Which is a raw score transformed into standard deviation units? (a) z score
(b) SDU score
(c) t score
(d) e score
✅ Correct option: (a) z score
Explanation:
A z-score represents a raw score converted into standard deviation units. It indicates how far a score is from the mean in terms of standard deviations. The formula is: z = (X − Mean) / Standard Deviation Z-scores allow comparison of scores from different distributions. A positive z-score indicates above-average performance, while a negative z-score indicates below-average performance.
10 Related PPSC Facts:
Z-score standardizes data. Mean z-score is zero. SD of z-scores is one. Used in normal distribution. Z-scores allow comparison. Positive z means above mean. Negative z means below mean. Used in hypothesis testing. Z-tables convert z to probability. Z-scores aid interpretation.