Researchers have studied a community in Massachusetts over a 10-year period. They collected data on the rate of automobile accidents among teenagers (aged 16-19 years) and the percentage of teenagers in the community who reported using their phones for texting during each year. Based on their data, the researchers conclude teenagers who report texting on their phones are more likely to be in a car accident.

What makes the study an ecologic design and the type of ecologic design?

Why do you think the researchers chose this design? What are the advantages of this design?

Do you agree with their conclusion.

Give at least three reasons why their conclusion on teenagers and automobile accidents could be wrong.