When quantitative measures for certain factors cannot be fixed the measure which is generally adopted is known as?

The correct answer is: E. Rank correlation coefficient

A rank correlation coefficient is a measure of the correlation between two variables, where the variables have been ranked rather than measured on a numerical scale. It is used when the data is ordinal, meaning that the data can be ordered but not measured on a precise scale.

The other options are not correct because they are all measures of correlation that are used when the data is measured on a numerical scale.

• Standard deviation is a measure of how spread out the data is. It is calculated by taking the square root of the variance.
• Quartile deviation is a measure of the spread of data that is based on the quartiles. The first quartile is the 25th percentile, the second quartile is the 50th percentile (median), and the third quartile is the 75th percentile. The quartile deviation is calculated by taking the difference between the third and first quartiles.
• Range is the difference between the largest and smallest values in the data set.
• Correlation coefficient is a measure of the strength of the linear relationship between two variables. It is calculated by taking the covariance of the two variables and dividing it by the product of their standard deviations.

I hope this helps!