The research objective is to determine whether smokers between 18 to 21 years of age have a lower IQ than those who do not smoke.
Work Step by Step
The goal is explicitly stated in lines 5, 6 and 7.
You can help us out by revising, improving and updating this answer.Update this answer
After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.