Question 1130703
Ho:rate is 10%
Ha: rate is not equal to 10%
alpha=0.10
test statistic is a one sample proportion z, where z=(phat-p)/sqrt((p*(1-p)/n))
critical value |z|>1.645
p hat is 0.076
z=(p hat-p)/sqrt(p*(1-p)/n)
=-.024/sqrt (.1*.9/394)=-.024/0.0151
=-1.59 o-value 0.11
This is not in the critical region.  Fail to reject Ho; there is insufficient evidence to say the accuracy rate is not 10%.  Note, the wording of the question uses "acceptable" without defining what it is.  Does the accuracy rate appear to be fewer than ten per cent? would have been a clearer question.