Question

The positive square root of the mean of the squares of the deviations of observations from their mean is called

Answer 1

Answer:

Standard Deviation

Explanation:

Standard Deviation. In essence, it is the square root of the arithmetic mean of the squares of deviations of observations from their mean value. It is generally denoted by sigma i.e. σ.

Answer 2

The positive square root of the mean of the squares of the deviations of observations from their mean is called STANDARD DEVIATION

Standard Deviation:

The positive square root of the mean of the squares of the deviations of observations from their mean

This is square root of variance

Variance:

Mean of the squares of the deviations of observations from their mean

Variance = ( Standard deviation)²

Range:

Difference between highest and lowest value in the data

CV ( Coefficient of Variation)

This is the ratio of standard deviation and Mean.

Variance , Range and SD are measure of Dispersions / spread.

Correct option is :

The positive square root of the mean of the squares of the deviations of observations from their mean is called STANDARD DEVIATION

Additional Info:

The four measures of spread are range, standard deviation, variance, and quartiles.  

Median, mean, and mode are the measures of central tendency

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