The State Highway Department Is Studying Traffic Patterns on One

question 98

Multiple Choice

The state highway department is studying traffic patterns on one of the busiest highways in the state. As part of the study, the department needs to estimate the average number of vehicles that pass an intersection each day. A random sample of 64 days gives us a sample mean of 14,205 cars and a sample standard deviation of 1,010 cars. After calculating the confidence interval, the highway department officials decide that the precision is too low for their needs. They feel the precision should be 300 cars. Given this precision, and needing to be 99 percent confident, how many days do they need to sample?

• A) 109
• B) 80
• C) 79
• D) 62
• E) 9

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Definitions:

Ecosystem

A biological community of interacting organisms and their physical environment, interconnected through nutrient cycles and energy flows.

Physical Environment

The external surroundings and conditions in which an organism lives, including land, water, air, and other natural factors influencing its growth and survival.

Living Organisms

Entities characterized by growth, reproduction, response to stimuli, and the ability to sustain metabolic processes.

Hypothesis

A proposed explanation for a phenomenon, made as a starting point for further investigation, that can be tested through experimentation and observation.