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Statistical Theory: Calculating Optimal Sample Size

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Statistical Theory: Calculating Optimal Sample Size

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Questions and Answers

Why is sampling necessary in research studies?

To make the research process more expensive.

To introduce sampling errors intentionally.

To ensure all variables studied have high variance.

To obtain data from the entire population under study. (correct)

What is the main advantage of using sampling in research?

More errors introduced in the study.

Greater expense in data collection.

Higher representativeness of the sample. (correct)

Slower data gathering process.

What is a census in the context of research studies?

A count of a select group of respondents.

An accounting of the complete population under study. (correct)

A quick estimation based on a small sample size.

An analysis of secondary data sources.

Which of the following is NOT a reason for using sampling in research?

To introduce bias intentionally into the study. Signup and view all the answers

What does 'population' or 'universe' refer to in the context of research?

The entire group under study as specified by research objectives. Signup and view all the answers

Which of the following best describes the concept of 'sampling error'?

The variability between observed sample value and true population value. Signup and view all the answers

'Census' differs from 'sampling' mainly in that it ________________.

Involves collecting data from everyone in the population. Signup and view all the answers

'Sampling pros' include ________________.

'Lower cost and faster data gathering.' Signup and view all the answers

'Sampling error' is undesirable because it ____________________.

'Affects accuracy by causing deviations from true values.' Signup and view all the answers

'Why do researchers prefer sampling over conducting a full census?'

'To obtain viable, lower-cost, and faster results.' Signup and view all the answers