Question

The variance of a sample of 81 observations equals 64. the standard deviation of the sample equals:

Answer 1

Let the Variance be denoted by v and the Standard deviation be s.

The Standard deviation is the square root of the Variance of a set of data,

so
`s= √(v)`,

thus the Standard deviation when the variance v=84 is


`s= √(v)=√(64)=8`,


Answer: 8