A 100(1-α)% Confidence Interval for the Population Mean μ Based $\bar{X}$

Multiple Choice

A 100(1-α) % confidence interval for the population mean μ based on a sample of size n with a sample mean $\bar{X}$ and a known population standard deviation σ is given by ________.

A) $\bar{x} \pm z_{a} / 2(n-1) (\sqrt{n})$

B) $\bar{x} \frac{(\sigma / \sqrt{n}) }{Z_{a / 2}}$

C) $x 1-\bar{x} /(\sigma / \sqrt{n})$

D) $\bar{x} \pm z_{a / 2}(\sigma / \sqrt{n})$