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:

Male Employees

Refers to the segment of the workforce identified as male.

Mean Height

The average height calculated by summing all individual heights and dividing by the total number of individuals.

Confidence Interval

A range of values, derived from statistical analysis, that is likely to contain the value of an unknown population parameter.

Oil Filters

Devices used in engines to remove contaminants from engine oil, transmission oil, lubricating oil, or hydraulic oil.