In a study of high school students at least 16 years of age, researchers obtained the survey results summarized in the table below (based on data from "Texting While Driving and Other Risk Motor Vehicle Behaviors Among U.S. High School Students" by O'Malley, Shults, and Eaton, Pediatrics,Vol. 131, No.6).

	Irregular Seat Belt Use?
	Yes	No
Texted While Driving	1737	2048
Did not Text While Driving	1945	2775

• State the null and alternative hypotheses.

1. N0:Teenagers who send SMS while they drive are not likely to partake in other dangerous activities while operating a moto vehicle compared to their peers who avoid sending text messages while driving.
2. N: Adolescents who participate in texting and drinking are more than likely to participate in other dangerous activities while operating a moto vehicle compared to their peers who reframe from texting and driving
3. Adolescents who sends SMS while they drive are not likely to participate in other dangerous activities while operating a moto vehicle compared to their peers who avoid driving and texting.

• Assuming independence, what are the expected frequencies for each of these variables?