An Experiment Was Conducted to Determine the Effectiveness of a Method

question 43

Multiple Choice

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 percent and a standard deviation of 1.5 percent.If we wished to narrow the boundary around μ for a 98 percent confidence interval to within 0.5 percent,how many soil samples should be in our experiment.

• A) 437
• B) 33
• C) 9
• D) 6
• E) 3

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