Question 1158202
228 is 57% of 400
assuming randomness, etc.
this is a 1-sample proportion
test statistic at the 5% level (not given ) for a two way test is reject Ho if |z|>2.576

z=(p hat- po)/sqrt(p*(1-p)/n)
=0.02/sqrt(0.55*0.45/400)
=0.02/0.0249=0.804
fail to reject Ho, insufficient evidence to say there is a difference from 0.55.
p=0.42
A