Sampling and Bias Flashcards

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Note: We may include questions that have multiple correct answers. It's useful to remember specific examples to understand these concepts better.

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In health studies, what is meant by the population?

All the people in the group that scientists want to study.

A smaller group taken from the population to be studied.

It is quicker, cheaper, and easier than testing everyone.

It has a similar mix of ages, sexes, and other features as the whole population.

Choosing people by chance so everyone in the population has an equal chance to be picked.

A problem that makes the results unfairly favour one group or one answer.

It stops the researcher choosing people who fit their own ideas, on purpose or by accident.

Asking only people at a gym how much people in the country exercise.

A very small sample may give odd results. A larger sample is usually more reliable.

Bias that happens when only people who choose to take part are in the sample, such as an online poll.

They can use random methods and make sure they include people from different groups in the population.