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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Definitions:

Object Permanence

The realization by infants that objects still exist even when they are out of sight, sound, or touch.

Conservation

The action of preserving, protecting, or restoring the natural environment, natural ecosystems, vegetation, and wildlife.

Attention Span

The duration for which a person is able to concentrate on a particular task or activity without getting distracted.

Intimacy Versus Isolation

A stage in Erik Erikson's theory of psychosocial development where the challenge is to develop close, committed relationships with others.