Researchers at the Medical College of Wisconsin studied 2,121 children between the ages of 1 and 4 (Milwaukee Journal Sentinel, November 26, 2005). For each child in the study, a measure of iron deficiency and the length of time the child was bottle- fed were recorded. The resulting data were used to learn about whether there was a relationship between iron deficiency and the length of time a child is bottle fed. Additional Exercises
For each of the studies described in Exercises 7.25 to 7.29, answer the following key questions:

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Question Type study Type Type of Data Number of Samples Estimation or hypothesis testing? Sample data or experiment data? One variable or two? Categorical or numerical? How many samples or treatments? or Treatments