Testing:

H0:p=0.89\displaystyle {H}_{{0}}:{p}={0.89}
Hα:p<0.89\displaystyle {H}_{\alpha}:{p}<{0.89}

Your sample consists of 72 subjects, with 62 successes. Calculate the test statistic

 \displaystyle z=\displaystyle {z}= Rounded to 2 decimal places.