Nationwide Insurance would like to perform a chi- square test to investigate whether a difference exists in the proportion of male and female teenagers who text while they drive. A random sample of 80 male teenagers found that 50 indicated they texted while driving. A random sample of 120 female teenagers found that 65 indicated they texted while driving. The degrees of freedom for the chi- square critical value is ______.

Question

Quizplus · Accepted Answer

The degrees of freedom for a chi-square test in this context is calculated as (number of rows - 1) * (number of columns - 1). Since there are 2 groups (male and female) and 2 outcomes (texted while driving, did not text while driving), the calculation is (2-1)*(2-1) = 1.

Nationwide Insurance Would Like to Perform a Chi- Square Test