Mathematics, 15.04.2020 03:16 maybaby9625

A chemist examines 15 geological samples for potassium chloride concentration. The mean potassium chloride concentration for the sample data is 0.376 cc/cubic meter with a standard deviation of 0.0012. Determine the 95% confidence interval for the population mean potassium chloride concentration. Assume the population is approximately normal.

Required:
Find the critical value that should be used in constructing the confidence interval. Round your answer to three decimal places.

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