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:

Behavioral

Pertaining to the actions or reactions of persons or objects under certain conditions, often studied in psychology and behavioral sciences.

Psychographic

Relating to the study and classification of people according to their attitudes, aspirations, and other psychological criteria, often used in market research.

Demographic

Statistical data relating to the population and particular groups within it, often used in market analysis to segment audiences.

Lifestyle

A person’s typical way of life as expressed by his or her activities, interests, and opinions.