Modern Technology University studied records of 500 traffic

Modern Technology University studied records of 500 traffic crushes in the past year involving drivers with cell phones. It was found that cell phone use quadruples the risk of a traffic crush. Which of the following identifies the type of the study described here?
a) Observational study c) Randomized experiment
b) Double blind experiment d) Case-controlled study

Solution

Modern Technology University studied records of 500 traffic crushes in the past year involving drivers with cell phones. It was found that cell phone use quadruples the risk of a traffic crush. Which of the following identifies the type of the study described here?
a) Observational study c) Randomized experiment
b) Double blind experiment d) Case-controlled study

This is Observational study

In this type of study in which individuals are observed or certain outcomes( traffic crushes) are measured. No attempt is made to affect the traffic crush by cell phone use.