Use this sample data to construct a 90% confidence interval for the mean number of targeted industrial chemicals to be found in an infant's blood.

MATLAB: An Introduction with Applications
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ISBN:9781119256830
Author:Amos Gilat
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Chapter1: Starting With Matlab
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In Oct. 2008, scientists tested cord blood samples for 20 newborn infants in USA. The scientists were testing for 430 harmful chemicals linked to brain and nervous toxicity.

The numbers below showed many of the targeted chemicals found in each infant's cord blood.

79   145   147   160   116   100   159   151   156   126

137   83   156   94    121     144   123  114   139     99

Use this sample data to construct a 90% confidence interval for the mean number of targeted industrial chemicals to be found in an infant's blood.

Write your answer to 3 decimal places

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