Which of the Following Conditions Does Not Allow You to Use

Multiple Choice

Which of the following conditions does not allow you to use the formula $\bar { x } \pm z _ { a / 2 } \sigma / \sqrt { n }$ to estimate $\mu$ ?

A) Population is normally distributed and the population variance is known.
B) Population is not normally distributed but n is large; population variance is known.
C) Population has any distribution and n is any size.
D) All of these choices allow you to use the formula.