National Average
Standard deviation is a statistical concept and not applicable to concrete.
National Average
standard deviation
In statistical analysis, the value of sigma () can be determined by calculating the standard deviation of a set of data points. The standard deviation measures the dispersion or spread of the data around the mean. A smaller standard deviation indicates that the data points are closer to the mean, while a larger standard deviation indicates greater variability. Sigma is often used to represent the standard deviation in statistical formulas and calculations.
Standard deviation of 0 can only be attained if all observations are identical. That is, the variable in question has just one possible value so statistical considerations are irrelevant.
Standard Deviation
It is the standard error.
No, it is a statistical measure of the spread of a distribution of some variable.
Statistical tools are tool which are purposively make or are use for data collection and analysis in research methodology. E.g destriptive. mean. standard deviation. chi_square e.t.c
You most certainly can. The standard deviation, however, has better statistical properties.
Standard deviation is a statistical measure. It may be used in psychology but is not restricted to that subject. It is a measure of the spread of the distribution of values of some attribute that is being measured.
Standard deviation