2
Chi-Square
In a study based on high school students at least 16 years of age, researchers obtained the survey results summarized in a table based on data from “Texting while driving and other risk motor vehicle behaviors among U.S. High School Students”
Irregular Seat Belt Use? Yes
No
Texted While driving
1737
2048
Did not Text While Driving
1945
2775
State the null and alternative hypotheses Null Hypothesis (
Hₒ
) Texting while driving and irregular seat belt use are independent of each other
Alternative Null Hypothesis (
Hɑ
) Texting while driving and irregular seat belt use are not
independent of each other
1.
Assuming independence, what are the expected frequencies of each of these variables, and whether they are related Chi-Square test of independence: ( x²) = Ʃ (0-E)÷E ) ²
Yes Observed (fre ob) No
Texted - 1737 Texted- 2048 =3785 Total No Text-1945 No Text 2775=4720
