Question 1127908
z=(phat-p)/sqrt((p*(1-p)/n), assuming random sample, etc.
test stat is a z with critical value > |1.28|
z=-0.05/sqrt (.55*.45/80)=-0.05/0.0556=-0.899
This is less than the critical value, so there is insufficient evidence to reject the claim. p-value is 0.37