Question 1121208
Ho: rate is 15% (>15% would not be wrong, but a two way test is more stringent.)
Ha: rate Not 15%
alpha=0.01
test statistic is a one sample proportion
critical value is |z|>2.576
calculation is (p hat-p)/sqrt (.15*.85/560), p hat= 96/560=0.171
(0.021)/0.0150=1.43
fail to reject.  The rate may be 15%.  Perhaps a larger sample size might show a difference.