Question

1. what is the symbol used to represent variance?

a. $\sigma$
b. $\sigma$
c. $\pi$
d. $\sigma^2$

Explanation:

To determine the symbol for variance, we analyze each option:

• Option a: $\Sigma$ is the summation symbol, not for variance.
• Option b: $\sigma$ represents standard deviation, not variance.
• Option c: $\pi$ is the mathematical constant (≈3.1416), unrelated to variance.
• Option d: $\sigma^2$ is the standard notation for population variance.

Answer:

d. $\sigma^2$