Sampling Frame

Cluster Sampling

Simple Random Sampling

Stratified Random Sampling

Which of the following is a key characteristic of probability sampling?

A researcher wants to study stress levels among all undergraduate students at a university. She posts flyers inviting volunteers and enrolls every student who responds. She reasons that because she can count exactly how many students signed up out of the total enrollment, she can calculate each person's probability of being in her sample, and therefore she is using probability sampling.

A psychologist is conducting a study on the relationship between sleep quality and academic performance. They intend to use a probability sampling method to ensure every student at their university has a known, mathematically specified chance of being included. Arrange the following steps in the correct order to execute this sampling plan.

A researcher is evaluating different sampling strategies for a study on campus life. Match each specific sampling scenario with the logical reason it either meets or fails the mathematical requirements of probability sampling.

A psychologist evaluates a colleague's study on social anxiety and concludes that the sampling method fails to meet the criteria for probability sampling. This judgment is justified because the colleague cannot mathematically specify the exact ________ that each member of the defined population will be selected.