Q1. The positive square root of the mean of the squares of the deviations of observations from their
mean is called:
Variance
Range
O Standard deviation
O CV
Answers
The positive square root of the mean of the squares of the deviations of observations from their Standard deviation.
Standard deviation:
- Standard deviation may be defined as the positive square root of the arithmetic mean of the squares of all the deviations of the values from their arithmetic mean.
- It is the most common and widely used measure of dispersion.
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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