Display 3.15 shows relative brain weights (brain weight divided by body weight) for 51 species of mammal whose average litter size is less than 2 and for 45 species of mammal whose average litter size is greater than or equal to2.(Thesearepartofalargerdata set considered in Section 9.1.2.) What evidence is there thatbrainsizestendtobedifferentforthe two groups? How big of a difference is indicated? Include the appropriate statistical measures of uncertainty in carefully worded sentences to answer these questions.