During the years 1994 to 2007 seat belt use among front seat passengers ages 16 to 24 has increased. A linear model for the percentage of these passengers who use a seat belt is where P is percentage with a seat belt and t is years since 2000. The years before 2000 have a negative value for t. What is the slope of the model and what does it mean in terms of the problem?
A) 2.33. Every year seat belt use goes down 2.33.
B) 2.33. Every year seat belt use goes down 2.33%
C) 2.33. Every year seat belt use goes up 2.33%
D) 64.60. Seat belt use started at 64.60%

Question

During the years 1994 to 2007 seat belt use among front seat passengers ages 16 to 24 has increased. A linear model for the percentage of these passengers who use a seat belt is  where P is percentage with a seat belt and t is years since 2000. The years before 2000 have a negative value for t. What is the slope of the model and what does it mean in terms of the problem?
A) 2.33. Every year seat belt use goes down 2.33. 
B) 2.33. Every year seat belt use goes down 2.33% 
C) 2.33. Every year seat belt use goes up 2.33% 
D) 64.60. Seat belt use started at 64.60%

Quizplus · Accepted Answer

The slope of the model is 2.33, which means that for every year since 2000, the percentage of front seat passengers ages 16 to 24 using a seat belt has increased by 2.33%. So, choice C is the correct answer as it correctly explains what the slope means in terms of the given problem.

During the Years 1994 to 2007 Seat Belt Use Among