The following data represent the concentration of dissolved organic carbon (mg/L) collected from 20 samples of organic soil. Assume that the population is normally distributed. Complete parts (a) through (c) on the right. 20.46 20.46 8.81 30.91 19.80 29.80 15.72 15.72 14.86 14.86 Question content area bottom Part 1 (a) Find the sample mean. (Round to two decimal places as needed.) Part 2 27.10 20.46 5.30 5.30 8.09 (b) Find the sample standard deviation. (Round to two decimal places as needed.) Part 3 (c) Construct a 80% confidence interval for the population mean μ. 16.51 14.90 15.35 7.40 7.40 15.72 15.72 33.67 9.72 18.30

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