A College Dean Wants to Determine the Average Time It

question 2

Multiple Choice

A college dean wants to determine the average time it takes a student to get from one class to the next.Preliminary studies have shown that it is reasonable to let _t = 1.5 minutes the standard deviation of class travel times) .What is the sample size which should be examined if the dean wants to assert with a probability of 95 percent that his estimate, the mean time of the random sample, will not be "off" by more than .25 minutes in either direction) ? Choose the closest answer.

• A)72 or more, but not less
• B)81 or more, but not less
• C)139 or more, but not less
• D)200 or more, but not less
• E)None of the above

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Definitions:

Fault Scarp

A fault scarp is a steep incline or cliff formed by the movement of a fault, where one side of the fault has moved vertically with respect to the other.

Columnar Joints

Natural formations of vertically oriented, hexagonal columns of rock, usually found in volcanic basalt, resulting from the cooling and contraction of lava.

Shear Zone

A region of the Earth's crust where rocks have been significantly deformed due to shear stress.

Folded Metamorphic Rocks

Metamorphic rocks that have been subjected to significant pressure and heat, resulting in a folded appearance due to deformation.