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Exam 13: Sampling

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Question 1

True/False

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From statistical considerations the preference is given to probability sampling over non-probability sampling.

A) True
B) False

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Question 2

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What is the least reliable and least efficient probability sampling technique?

A) Systematic sampling.
B) Proportionate stratified sampling.
C) Disproportionate stratified sampling.
D) Cluster sampling.

E) A) and D)
F) A) and C)

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D

Question 3

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Snowball sampling and Quota sampling are both non-probability sampling techniques.

A researcher wants to investigate the relationships between the use of drugs and study results of university students.He would like to generalize the results to the population.Which kind of sample could the researcher best use?

If a sample is subdivided into subsamples,a minimal sample size of 10 is necessary for every subsample.

Probability sampling is seen as less representative for the population than non-probability sampling.

Stratified sampling and cluster sampling are examples of probability sampling.

When representativity is an important criterion for a study,which sampling technique would you choose? a.Systematic sampling. b.Judgment sampling. c.Quota sampling. d.Convenience sampling.

In probability sampling all elements of a population have a known and equal change to be included in the sample.

Non-probability sampling leads to findings that are highly generalizable.

Simple random sampling is a method associated with a high degree of generalizability.

Based on the desired accuracy and reliability of the research results,we can determine a desired sample size by a formula.The desired sample size is adjusted (and we then speak of an adjusted n) when:

If a sample is subdivided into subsamples,a minimal sample size of 30 is necessary for every subsample.

As a rule,probability sampling leads to a representative sample.

The bigger the sample size,the better.

Snowball sampling and judgment sampling are both non-probability sampling techniques.

Cluster sampling is the least representative probability sampling design.

Which of the following sampling designs is a form of non-probability sampling?

With systematic sampling one divides the population into subgroups and chooses the test subject randomly from a number of randomly chosen subgroups.

Convenience sampling and quota sampling are examples of probability sampling.