The iron contents of fruits before and of ter applying form yard manure were obser ved as follows. (See figure) Is there any Significant difference between the mean iron contents in the fruits before & after the form yorn manure? Fruit no. -1,2,3,4,5,6,7,8,9,10 Before applying. 7.7,8.5,7.2,6.3,8.1,5.2,6.5,9.4,8.3,7.5 After applying -=8.1,8.9,7.0,6.1,8.2,8.0,5.8,8.9,8.7,8.0