A researcher is investigating the daily commute times of employees at a large corporation. The corporation provides a complete alphabetical database of all 1,2001{,}2001,200 employees. To select a sample of size 30, the researcher picks a random starting number between 1 and 40, and then selects every 40th employee on the list.
Which sampling technique is the researcher employing, and what is the probability of any individual employee being selected in this sample?
Stratified sampling, with a selection probability of 0.0250.0250.025 for each employee.
Systematic sampling, with a selection probability of 0.0250.0250.025 for each employee.
Systematic sampling, with a selection probability of 0.0330.0330.033 for each employee.
Opportunity sampling, with a selection probability of 0.0250.0250.025 for each employee.
644 exam-style questions on OCR A Level Psychology Research methods and techniques. Each one has a worked solution and a mark scheme showing where the marks go.