Sampling

cluster random sampling

A hospital wants to survey religious participants in their city about what they seek from a hospital chaplain, so they randomly select 5 religious meetings in the city and survey every participant in those meetings.

Stratifed Random Sampling

A large company surveys 100 employees by taking random samples of 10 managers and 90 non-managerial employees.

simple random sampling

A manager associated each employee's name with a number on one ball in a container, then drew balls without looking to select a sample of 5 employees.

conveience sampling

A quality control worker at a factory selects the first 10 items she sees as her sample for the day.

convenience sample

A store prints a request on each receipt asking customers to fill out a satisfaction survey online if they are willing

simple random sampling

A teacher puts students' names in a hat and chooses without looking to get a sample of 3 students.

systematic random sampling

Security workers at an airport randomly choose one of the first 50 people to pass through a checkpoint for extra security screening. After that person, they choose every 50th person who passes through for extra screening as well.