Question 1181639
Ho:muA=muB
Ha: muA NE muB
alpha=0.05 p{reject Ho|Ho true}
test stat is a 2 way t df=30 (will use the simpler formula of n1+n2-2
critical value is |t| > 2.042
calculation is t=(85-81)/sqrt (s1^2/n1+s2^2/n2)
=4/sqrt(16/15)+(25/17)
=4/1.593
=2.51
reject Ho and there is a difference between the two at the 5% level of significance
p-value=0.0177