The adoption of smart phones and social media apps has been much discussed. One aspect of these devices is that students tend to be distracted by their phones during class. A recent survey reported that 86% of 1004 randomly sampled females used their smart phones during class time, compared to 81% of 1009 randomly sampled males. Do these results confirm a higher smart phone usage by females?

1. Test an appropriate hypothesis and state your conclusions.

2. Find a 99% confidence interval for the difference in the proportion of males and females who use their phone during class. Interpret your interval.