The Approximate 95% Confidence Interval for a Population Mean Is $x \pm \sigma / \sqrt { n }$

Multiple Choice

The approximate 95% confidence interval for a population mean is:

A)
$x \pm \sigma / \sqrt { n }$
B)
$x \pm s / \sqrt { n }$
C)
$$X \pm 2 \sigma / \sqrt { n }$$
D)
$x \pm 2 s l \sqrt { n }$