Question

what is the symbol used to represent variance?
a. $\sigma$
b. $\sigma^2$
c. $\pi$
d. $\sigma$

Explanation:

• Option a: $\Sigma$ is the symbol for summation, not variance.
• Option b: $\sigma^{2}$ is the symbol used to represent the population variance.
• Option c: $\pi$ is a mathematical constant (approximately 3.14159), not related to variance.
• Option d: $\sigma$ represents the population standard deviation, not variance (variance is the square of the standard deviation).

Answer:

b. $\boldsymbol{\sigma^{2}}$