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.

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To describe the sample and the population of interest for the study mentioned, we can break it down as follows:

### Population of Interest
The population of interest refers to the entire group that the researchers are interested in studying. In this case, the population consists of:

- **All children** between the ages of **1 and 4 years old** who may be affected by iron deficiency and bottle-feeding practices. This includes all children within this age range, regardless of their geographical location, socioeconomic status, or any other factors.

### Sample
The sample is the specific group of individuals that were actually studied to draw conclusions about the population. In this case, the sample consists of:

- **2121 children** between the ages of **1 and 4 years old** who were studied by the researchers at the Medical College of Wisconsin. This sample is a subset of the larger population and was used to investigate the association between iron deficiency and the length of time that a child is bottle-fed.

### Summary
- **Population**: All children aged 1 to 4 years old.
- **Sample**: 2121 children aged 1 to 4 years old studied by the researchers.

This distinction is important in research as it helps to understand the scope of the findings and how they can be generalized to the larger population.
The study looked at 2121 children between 1 and 4 years old to see if bottle-feeding time is linked to iron deficiency. The **population** is all children aged 1 to 4, and the **sample** is the 2121 children studied.

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