23. Rickets. Vitamin D, whether ingested as a dietary
Chapter 19, Problem 23(choose chapter or problem)
23. Rickets. Vitamin D, whether ingested as a dietary supplementor produced naturally when sunlight falls on theskin, is essential for strong, healthy bones. The bone diseaserickets was largely eliminated in England during the1950s, but now there is concern that a generation of childrenmore likely to watch TV or play computer gamesthan spend time outdoors is at increased risk. A recentstudy of 2700 children randomly selected from all parts ofEngland found 20% of them deficient in vitamin D.a) Find a 98% confidence interval.b) Explain carefully what your interval means.c) Explain what 98% confidence means.
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