The drinking water supplies in an area were tested for levels of chloramine and reported the average triplicate chloramine concentrations in parts per million for the fifteen sampling sites: 2.80, 3.57, 4.08, 4.13, 3.77, 3.16, 4.01, 3.92, 2.93, 4.15, 3.44, 5.03, 1.17, 1.18, 3.08. Answer the following: a. At 90 percent confidence level, is outlier present? Identify the outlier, if present; otherwise, write NONE. b. At 90 percent confidence level, what is the mean chloramine concentration (in ppm) of the drinking water supply in the area? Write the answer in THREE SIGNIFICANT FIGURES. c. At 90 percent confidence level, what is the coefficient of variation for this set of data? Write the answer in THREE SIGNIFICANT FIGURES.
The drinking water supplies in an area were tested for levels of chloramine and reported the average triplicate chloramine concentrations in parts per million for the fifteen sampling sites: 2.80, 3.57, 4.08, 4.13, 3.77, 3.16, 4.01, 3.92, 2.93, 4.15, 3.44, 5.03, 1.17, 1.18, 3.08. Answer the following:
a. At 90 percent confidence level, is outlier present? Identify the outlier, if present; otherwise, write NONE.
b. At 90 percent confidence level, what is the
c. At 90 percent confidence level, what is the coefficient of variation for this set of data? Write the answer in THREE SIGNIFICANT FIGURES.
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