Identify which type of sampling is used: random, stratified, cluster, systematic, or convenience. 1. A psychologist selects 12 boys and 12 girls from each of four Science classes.

2. When he made an important announcement, he based his conclusion on 10 000 responses, from
100 000 questionnaires distributed to students.

3. A biologist surveys all students from each of 15 randomly selected classes.

4. The game show organizer writes the name of each contestant on a separate card, shuffles the cards, and
draws five names.

5. Family Planning polls 1 000 men and 1 000 women about their views concerning the use of contraceptives.

6. A hospital researcher interviews all diabetic patients in each of ten randomly selected hospitals.​