AirPods are Apple’s most popular accessory product, with 35 million units sold in 2018 alone (AppleInsider, March 15, 2019). Suppose you are put in charge of determining the age profile of people who purchased AirPods in the United States. Explain in detail the following sampling strategies that you could use to select a representative sample.

a. Simple random sampling.

b. Stratified random sampling.

c. Cluster sampling.