An Experiment Was Conducted to Determine the Effectiveness of a Method

question 76

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

• 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:

Squared Deviations

The squares of the differences between individual observations and the mean of those observations, often used in statistical analysis to measure variance.

Regression Line

A statistical tool used in linear regression analysis that represents the relationship between two variables, showing the expected value of the dependent variable for a given value of the independent variable.

Margin Of Safety

The excess of budgeted or actual dollar sales over the break-even dollar sales.

Margin Of Safety Percentage

A financial ratio that measures the difference between actual or projected sales and the break-even point, expressed as a percentage of sales.