According to the 2015 High School Youth Risk Behavior Survey, 41.5% of high school students reported they had texted or emailed while driving a car or other vehicle. Suppose you randomly sample 80 high school students and ask if they have texted or emailed while driving. Suppose 38 say yes and 42 say no. Calculate the observed value of the chi-square statistic for testing the hypothesis that 41.5% of high school students engage in this behavior.