We're told Della has over 500 songs on her mobile phone, and she wants to estimate what proportion of the songs are by a female artist. She takes a simple random sample, that's what SRS stands for, of 50 songs on her phone, and finds that 20 of the songs sampled are by a female artist. Based on this sample, which of the following is a 99% confidence interval for the proportion of songs on her phone that are by a female artist? So like always, pause this video and see if you can figure it out on your own. Della has a library of 500 songs right over here, and she's trying to figure out the proportion that are sung by a female artist. She doesn't have the time to go through all 500 songs to figure out the true population proportion, P, so instead she takes a sample of 50 songs, N is equal to 50, and from that she calculates a sample proportion, which we could denote with P hat, and she finds that 20 out of the 50 are sung by a female. 20 out of the 50, which is the same thing, is 0.4, and then she wants to construct a 99% confidence interval.