An Experiment Was Conducted to Determine the Effectiveness of a Method

question 150

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% and a standard deviation of 1.5%.If the percentage of contamination is normally distributed,the mean percentage of contamination removed at a 98% confidence level would be _____.

• 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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Definitions:

Age

The length of time that a person or organism has been alive or a thing has existed.

Phototoxic Reactions

Skin reactions that result from exposure to certain chemicals and subsequent exposure to light, leading to skin damage.

Premature Aging

The condition of experiencing the signs and symptoms of aging at an early stage, often due to genetic factors or environmental exposure.

Skin Cancer

The abnormal growth of skin cells, commonly developing on skin exposed to the sun, but can occur anywhere on the body.