Suppose the Following Is to Be Tested $\mathrm { H } _ { 0 } : \mathrm { p } = 0.4$

Essay

Suppose the following is to be tested:
$\mathrm { H } _ { 0 } : \mathrm { p } = 0.4$ and $\mathrm { H } _ { \mathrm { a } } : \mathrm { p } \neq 0.4$ . Calculate the observed $\mathrm { z }$ test statistic for the following sample data:
$n = 80$ and 25 test subjects have the characteristic of interest. Round to the nearest thousandth.