"To select the sample" means choosing a smaller group of individuals or items from a larger population to collect data or information from for analysis or study. Full definition
Simply selecting samples of work as described above can produce meaningful stories about students, and others can benefit from «reading» these stories. (jfmueller.faculty.noctrl.edu)
Few people select a sample resume from Internet and by the small editing they create their resume from that resume. (bestsampleresume.com)
Otherwise, select a sample chapter from one of your other books. (mybookcave.com)