For the practice passages, identify inadequacies in the evidence

Are the statistics deceptive? For the practice passages, identify inadequacies in the evidence.

Passage: 

A new study shows that teens who send excessive numbers of text messages may be at risk for unhealthy behaviors. The study focused upon a sample of students in an urban Michigan county, most of whom were from a lower socioeconomic status, were a member of a minority group, and had no father in the home. Researchers found that teens who excessively text are 50 percent more likely to have tried cigarettes, 45 percent more likely to be in a physical fight, and 35 percent more likely to be binge drinkers. This study should serve as a wake-up call to parents and prompt them to discourage their children from texting excessively.