Question: 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.

1. [48.36 50.24]
2. [47.67 50.93]
3. [47.29 51.31]
4. [47.88 50.72]
5. [46.47 52.13]

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