An Experiment Was Conducted to Determine the Effectiveness of a Method

question 4

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.Estimate the mean percentage of contamination removed at a 98 percent confidence level.

• A) \(\left[ \begin{array} { l l }
• 48.36 & 50.24
• \end{array} \right]\)
• B) \([ 43.27 \quad 55.33 ]\)
• C) \(\left[ \begin{array} { l l }
• 47.29 & 51.31
• \end{array} \right]\)
• D) \([ 47.88\)\( \quad\)\( \quad\)\(50.72 ]\)
• E) \([ 46.47 \quad 52.13 ]\)

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Definitions:

Condensation

The process by which a gas transforms into a liquid, often observed as water vapor in the air turning into liquid water droplets on cool surfaces.

Hydrologic Cycle

The continuous movement of water on, above, and below the surface of the Earth, including processes such as evaporation, precipitation, and infiltration.

Evaporation

The process by which water changes from a liquid to a gas or vapor, often contributing to the hydrologic cycle and weather patterns.

Precipitation

Any type of water, whether in liquid or solid state, that descends from clouds and makes contact with the Earth's surface, encompassing rain, snow, sleet, and hail.