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A student examines 16 sedimentary samples for iron concentration. The mean iron concentration for the sample...

A student examines 16 sedimentary samples for iron concentration. The mean iron concentration for the sample data is 0.400cc/cubic meter with a standard deviation of 0.0127. Determine the 90% confidence interval for the population mean iron concentration. Assume the population is approximately normal.

Step 2 of 2 :  

Construct the 90% confidence interval. Round your answer to three decimal places.

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