Question 1195793
Ho: rate is 10%
Ha: rate is not 10%
alpha is 0.05 p{reject Ho|Ho true}
test is z= (phat-0.10)/sqrt(p*(1-p)/n)
reject if |z|>1.96
z=(0.08-0.10)/sqrt(0.1*0.9/150)
=-0.02/0.0245=-0.82
fail to reject; insufficient evidence to say there has been any chang.