For the formula for calculating the confidence level with known standard deviation, the value ________ represents the value of a standard normal random variable with a cumulative probability of 1 - α / 2.
A)$\sigma / \sqrt{n}$

B)$z_{a / 2}$

C)$\bar{x}$

D)$x_{i}-\bar{x}$

Question

For the formula for calculating the confidence level with known standard deviation, the value ________ represents the value of a standard normal random variable with a cumulative probability of 1 - α / 2.
A)$\sigma / \sqrt{n}$

B)$z_{a / 2}$

C)$\bar{x}$

D)$x_{i}-\bar{x}$

Quizplus · Accepted Answer

The value $z_{a / 2}$ represents the value of a standard normal random variable with a cumulative probability of 1 - α / 2, which is used in the formula for calculating the confidence level with known standard deviation. The other choices ($\sigma / \sqrt{n}$, $\bar{x}$, and $x_{i}-\bar{x}$) are not directly related to the confidence level formula with known standard deviation.

For the Formula for Calculating the Confidence Level with Known σ/n\sigma / \sqrt{n}σ/n​

For the Formula for Calculating the Confidence Level with Known $\sigma / \sqrt{n}$