1. A survey of 600 fatal accidents showed that 166 involved the use of a cell phone. Construct a 99% confidence interval for the proportion of fatal accidents that involved the use of a cell phone.
2. The engineering school at a major university claims that 20% of its graduates are women. In a graduating class of 211 students, 58 were females. Does this suggest that the school is believable? Use alpha =.05.