A researcher examines 4 sedimentary samples for mercury concentration. The mean mercury concentration for the sample data is 0.621 cc/cubic meter with a standard deviation of 0.0128. 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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