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A physicist examines 44 water samples for mercury concentration. The mean mercury concentration for the sample...

A physicist examines 44 water samples for mercury concentration. The mean mercury concentration for the sample data is 0.4700.470 cc/cubic meter with a standard deviation of 0.05810.0581. Determine the 80%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.

Step 2 of 2:

Construct the 80%80% confidence interval. Round your answer to three decimal places.

Math   Statistics-And-Probability   
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