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%. If we wished to narrow the boundary around μ for a 98% confidence interval to within 0.5%, how many soil samples should be in our experiment.

1. 437
2. 33
3. 9
4. 6
5. 3

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