Assignment 9-3 Confidence Intervals for Proportions 1. Who follows Katy Perry? Checking conditions Katy Perry is currently the most popular account on Twitter with about 100 million followers. Mr. Starnes wondered what proportion of Katy Perry's Twitter followers are female, so he selected a random sample of 500 of Katy Perry's followers. In the sample, 308 are female. Check if the conditions for constructing a confidence interval for p are met. Random: Large Counts: interval