Question 1157289
units should be cm^3 since volume
Ho: Volume greater than or equal to normal mu1>=mu2
Ha: volume less than normal, mu1 less than mu 2
alpha =0.05 p{reject Ho|Ho true}
test statistic is a t0.95, df=20)
critical value t<-1.725
calculations t=(xbar-mean)/s/sqrt(n)
=(8.14-9.02)/0.7/sqrt(21)
=-0.88*sqrt(21)/0.7
=-5.76
strongly reject Ho and conclude the hippocampal volume in alcoholic adolescents is less than normal ones.
p<5.8 x 10^-6 (generally <0.0001 is sufficient