Try This! Identify whether the following refer to a population or sample. A group of 45 students selected to test a new teaching technique. A total machines produced by a factory In three weeks. The yearly expenditures on food for 15 families. The ages of an employee of all companies in Northern Luzon. The number of subscribers of telephone companies. ACTIVITY NO. 1 Give at least three examples each in the following. 1. Lottery sampling 2. Stratified sampling 3. Systematic sampling 4. Cluster sampling 5. Convenience sampling 6. Snowball sampling 7. Quota sampling Try This! Classify each sample as random, stratified, systematic, or cluster. Every 14th Customer entering SM shopping mall is asked to select his or her favorite store. In PUP College of Engineering, all professors are interviewed to determine whether they believe the students have higher grades now than in previous years. Company managers are selected using random numbers in order to determine annual salaries. A teacher writes the name of each student in a card, shuffles the cards, and then draws nine names. A head nurse selects 12 patients from each floor of a hospital