Then they asked us, calculate a 99% confidence interval for the proportion of teachers who felt that computers are an essential teaching tool. Let's think about the entire population. We weren't able to survey all of them, but the entire population, some of them fall into the bucket and we'll define that as 1. They thought it was a good tool. They thought that the computers were a good tool. We'll just define a zero value as a teacher that says not good. Some proportion of the total teachers think that it is a good learning tool.