SOLUTION: Vitamin D is an essential ingredient for maintaining strong bones and teeth. Sources of this vitamin are natural sunlight and certain dietary supplements. There is a growing concer

Question 418462: Vitamin D is an essential ingredient for maintaining strong bones and teeth. Sources of this vitamin are natural sunlight and certain dietary supplements. There is a growing concern among pediatricians that today's youngsters are spending too much time indoors. This increases the risk of vitamin D deficiency and all of its related health issues. A research team would like to estimate the proportion of children (aged 6 to 12) that currently exhibit a deficiency in this micro-nutrient. For their purposes a 90% CI must be no wider than 9.5% to be useful. Given these constraints, the number of children required for the sample is?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
A research team would like to estimate the proportion of children (aged 6 to 12) that currently exhibit a deficiency in this micro-nutrient.
For their purposes a 90% CI must be no wider than 9.5% to be useful. Given these constraints, the number of children required for the sample is?
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2*E = 0.095
E = 0.0475
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E = zs/sqrt(n)
0.0475 = 1.645*s/sqrt(n)
---
n >= [1.645s/0.0475]^2
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I believe you need a value of the standard deviation (s).
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Cheers,
Stan H.

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