Question 1147800
Ho : p <=0.25
Ha: p > 0.25

p hat is 78/255=0.30588
alpha is 0.05, P{reject Ho|Ho true}, reject if P>1.645
test stat is a z (phat-p)/sqrt(p*(1-p)/n)
z=0.05588/sqrt(0.25*0.75/255)
z=2.06
reject Ho   YES
p-value is 0.020