Example 1. Percentage of female artists, based on year-to-date album-equivalent sales as of December 28, 2023, in the rock and pop genres, given different sample sources and sizes: a) a random sample of 200 observations from the top 10,000 artists, not including the top 200 artists, b) the top 200 artists, c) the top 100 artists, d) the top 50 artists, and e) the top 25 artists