An experiment was conducted to determine the effectiveness of a method designed to remove oil wastes found in soil.Three contaminated soil samples were treated.After 95 days,the percentage of contamination removed from each soil sample was measured with a mean of 49.3% and a standard deviation of 1.5%.Estimate the mean percentage of contamination removed at a 98% confidence level.
A)[48.36 50.24]
B)[43.27 55.33]
C)[47.29 51.31]
D)[47.88 50.72]
E)[46.47 52.13]

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The Answer of An experiment was conducted to determine the effectiveness of a method designed to remove oil wastes found in soil.Three contaminated soil samples were treated.After 95 days,the percentage of contamination removed from each soil sample was measured with a mean of 49.3% and a standard deviation of 1.5%.Estimate the mean percentage of contamination removed at a 98% confidence level.
A)[48.36 50.24]
B)[43.27 55.33]
C)[47.29 51.31]
D)[47.88 50.72]
E)[46.47 52.13]

An Experiment Was Conducted to Determine the Effectiveness of a Method