Suppose That the Following Is to Be Tested $\mathrm { H } _ { 0 } : \mathrm { p } = 0.72$

Multiple Choice

Suppose that the following is to be tested: $\mathrm { H } _ { 0 } : \mathrm { p } = 0.72$ and $\mathrm { H } _ { \mathrm { a } } : \mathrm { p } \neq 0.72$ . Calculate the observed z-statistic for the following sample data: Sixty-eight out of ninety test subjects have the characteristic of interest. Round to the nearest thousandth.

A) $z = 0.751$
B) $z = 0.756$
C) $z = - 0.751$
D) $\mathrm { z } = 0.453$