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A student examines 28 sedimentary samples for mercury concentration. The mean mercury concentration for the sample...

A student examines 28 sedimentary samples for mercury concentration. The mean mercury concentration for the sample data is 0.317 cc/cubic meter with a standard deviation of 0.0188 . Determine the 80% confidence interval for the population mean mercury concentration. Assume the population is approximately normal. Step 1 of 2 : Find the critical value that should be used in constructing the confidence interval. Round your answer to three decimal places.

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