A physicist examines 1010 water samples for iron concentration. The mean iron concentration for the sample data is 0.7110.711 cc/cubic meter with a standard deviation of 0.08160.0816. Determine the 90%90% confidence interval for the population mean iron concentration. Assume the population is approximately normal.
Find the critical value that should be used in constructing the confidence interval. Round your answer to three decimal places.
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