A study was designed to determine whether their infants were fed breastmilk have higher iron levels and those who are not to do this researcher measure the iron levels of two month old infants were breast-fed infants who were fed standard baby formula without any iron supplement the result of the study displayed on the graph below for your reference normal iron levels for two month old infants range from 11 to 15 g. A. formulate an appropriate Null hypothesis for this experiment