Real world applications come from Pingree.
Pingree found that gender stereotyping was reduced when children were shown TV adverts with women in non stereotypical roles (H and M AD).
However, pre adolescent boys stereotypes became stronger with exposure to non traditional models but this may be explained by a boys desire to maintain a masculine view.
Therefore this shows real world evidence to show that media can influence the way a child develops gender stereotypes and therefore increases the validity.