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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