The concentration of lead in the blood stream was measured for a sample of 50 children form
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The concentration of lead in the blood stream was measured for a sample of 50 children form a large school near a busy main road. The sample mean was 10.12 ng/mL, and the standard deviationwas 0.64 ng/mL. Approximately how large should the sample have been to reduce the range of the confidence interval to 0.2 ng/mL (i.e. ±0.1 ng/mL)?
Related Book For
Chemistry The Central Science
ISBN: 978-0321696724
12th edition
Authors: Theodore Brown, Eugene LeMay, Bruce Bursten, Catherine Murphy, Patrick Woodward
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