load pre_vitd_level.dat
load post_vitd_level.dat

pre_vitd_level(:,1)
post_vitd_level(:,1)

boxplot([pre_vitd_level(:,1),post_vitd_level(:,1)],'notch','on','labels',...
    {'Before','After'})

title('Vitamin D Levels in Children Before and After Drinking Vitamin D Fortified Whole Milk')

ylabel('25(OH)D, ng/ml')








