The following data represent the concentration of organic carbon (mg/L collected from organic soil. Construct a 99% confidence interval for the mean concentration of dissolved organic carbon collected from organic soil. Note that x = 17.63mg/L and s = 7.66mg/L.  Step 1: Compute a/2 for a = (1 − confidence level) and determine the sample mean and sample standard deviation. Step 2: Use Table IV to find ta/2 with df = n − 1.

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