Question 1177876
this is a 2-sample z-test where z=(difference in means)/sqrt (sigma 1^2/n1+sigma2^2/n2)
=$24850/sqrt (11200^2/342+9575^2/342)
=$24850/796.77
=31.2
critical value is |z|>1.645
reject Ho that the means are equal and conclude there is a difference-highly significant with p-value=0.