Question

If the population variance is 4, then the population standard deviation must be?

(1) 4:

(2) 16:

(3) 2:

(4) 0:

(5) 12

Answer 1

standard deviation $= \sigma$

Variance $= \sigma^2$

standard deviation $\sigma = \sqrt {variance}$

standard deviation $= \sqrt 4 =2$