Question 1172326
Ho: p=0.02
Ha: p NE 0.02
alpha=0.05 p{reject Ho|Ho true}
test is a 1 sample proportion, test stat is z and reject if |z| > 1.96
z=(0.03-0.02)/sqrt(0.02*0.98/400); the 0.03 is point estimate of 12/400
=0.01/0.007
=1.43
fail to reject Ho because of insufficient evidence to show a difference.
p-value=0.15