A Traffic Engineer Plans to Estimate the Average Number of Cars

question 109

Multiple Choice

A traffic engineer plans to estimate the average number of cars that pass through an intersection each day. Based on previous studies the standard deviation is believed to be 52 cars. She wants to estimate the mean to within ±10 cars with 90 percent confidence. The needed sample size for n is:

• A) n = 104 days.
• B) n = 74 days.
• C) n = 10 days.
• D) n = 9 days.

Incorporate the finite population correction factor where applicable in statistical tests and estimates.

Use statistical evidence to make decisions or inferences about population proportions.

Understand the structure and properties of cyclopentanone and its hydrates.

Demonstrate knowledge of reaction mechanisms involving acyl chlorides and other organic transformations.

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Definitions:

Absolute Threshold

The minimum intensity of a stimulus required to be correctly perceived by sensory systems at least 50% of the time.

Difference Threshold

The minimal change in stimulus that can just barely be detected by an organism, also known as the just noticeable difference (JND).

Trichromatic Theory

A theory of color vision proposing that colors are perceived through the relative rates of response by three kinds of cones, each one sensitive to a range of wavelengths.

Opponent-process Theory

A psychological and physiological model that explains how humans perceive colors as the result of complex interactions between various neurons that process color in an antagonistic manner.