The Highway Safety Department Wants to Study the Driving Habits

question 85

Essay

The Highway Safety Department wants to study the driving habits of individuals. A sample of 81 cars traveling on the highway revealed an average speed of 67 miles per hour with a standard deviation of 9 miles per hour.
a.Compute the standard error of the mean.
b.Determine a 99% confidence interval estimate for the speed of all cars.

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Definitions:

Revenue

The income generated from normal business operations and includes discounts and deductions for returned merchandise.

Denominator

The bottom number in a fraction that shows into how many equal parts the whole is divided.

Numerator

The number above the division line in a fraction. The numerator is also known as the dividend.

Fraction

A numerical quantity that is not a whole number, representing a part of a whole.