Relationship Between Sample and Population

A team of researchers wants to understand the typical sleep habits of all adults in a country of 50 million people. Since they cannot survey every individual, which of the following approaches would be the most practical and scientifically sound first step for their investigation?

Random Sample

Example of a Sample: Talkativeness Study

Representative Sample

Inferential Statistics

Probability Sampling

Non-probability Sampling

Determinants of Survey Sample Size

Convenience Sampling

Survey Non-responder

Simple Random Sampling

Sampling Bias

Measures of Central Tendency

To conduct a study, researchers typically select a smaller subset of individuals from a broader group of interest. This smaller subset is referred to as a ____.

Which of the following best explains why a psychology researcher would choose to study a sample rather than an entire population?

A researcher is investigating the exercise habits of all 5,000 employees at a corporate headquarters. Arrange the steps of the research process in the correct logical order to show how a sample is used to understand the entire group.

A psychologist investigates the study habits of all first-year college students by surveying 200 first-year students at a single university. Match each part of this study to its functional role in the sampling process.

A researcher concludes that a sample of 1,000 volunteers recruited from a specialized tech-support website is a methodologically sound group for evaluating the computer literacy of all adults in a nation. This conclusion is justified because a sample size this large ($N = 1,000$) automatically guarantees that the subset will closely resemble the entire group of interest.