Square root of deviation is also called as –
**Core Concept**
The question is testing the understanding of the concept of variability in statistics, specifically in the context of measurement error. The "square root of deviation" refers to the standard deviation, which is a measure of the amount of variation or dispersion of a set of values.
**Why the Correct Answer is Right**
The standard deviation is a widely used measure of variability, calculated as the square root of the average of the squared differences from the mean. It represents the amount of variation or dispersion of a set of values, with higher values indicating greater variability. The standard deviation is used in various fields, including medicine, to quantify the reliability of measurements and to compare the variability of different populations. In the context of measurement error, the standard deviation is used to express the precision of a measurement.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not relevant to the concept of variability in statistics.
* **Option B:** This option is not a correct synonym for the standard deviation.
* **Option C:** This option is not related to the concept of measurement error or variability.
**Clinical Pearl / High-Yield Fact**
One key point to remember is that the standard deviation is a measure of variability that is sensitive to outliers, so it may not always be the best choice for expressing variability in skewed distributions.
**Correct Answer: D. Standard deviation**