1.4 Based on a study of 2121 children between the ages of 1 and 4 , researchers at the Medical College of Wisconsin concluded that there was an association between iron defi- ciency and the length of time that a child is bottle-fed (Mil- waukee Journal Sentinel. November 26, 2005). De- scribe the sample and the population of interest for this study.

In this study, the sample consists of the 2,121 children aged 1 to 4 who were examined by researchers at the Medical College of Wisconsin to explore the correlation between iron deficiency and bottle-feeding duration. These children represent a smaller group selected to draw conclusions that may apply more broadly. The population of interest encompasses all children aged 1 to 4 within a certain demographic, potentially including various backgrounds and locations, who may be affected by iron deficiency and the practices surrounding bottle-feeding. The findings aim to shed light on common nutritional issues faced by this wider group of young children.