Question 1

When a proportionate stratified sampling plan is used, the weighted mean formula:

Accepted Answer

The answer of When a proportionate stratified sampling plan is...

Question 2

In stratified sampling, we should always ensure that the sample drawn for each stratum is:

Accepted Answer

The answer of In stratified sampling, we should always ensure...

Question 3

One of the advantages of systematic sampling is that:

Accepted Answer

Systematic sampling has "economic efficiency" meaning it requires less time and effort compared to other sampling techniques.

Question 4

Which technique allows you to achieve the benefits of random digit dialing by adding some randomly determined number to the telephone number drawn from the telephone directory?

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The answer of Which technique allows you to achieve the...

Question 5

In practice, simple random sampling should be strongly considered:

Accepted Answer

Simple random sampling is practical in all the situations mentioned. When the population is small and numbered easily, simple random sampling can be done manually. In telephone surveys, random digit dialing programs can generate random numbers that can be used for sampling. Similarly, computer programs can randomly select samples from electronic files of population units. Therefore, all the situations allow for the practical application of simple random sampling.

Question 6

Simple random sampling is an appealing method because:

Accepted Answer

Simple random sampling meets the requirements to obtain a probability sample, can be used to derive unbiased estimates of population characteristics, guarantees every population member has an equal chance of being selected, and results in a valid representation of the population. Therefore, all of the above are true and E is the correct answer.

Question 7

A sampling method that separates the population into different subgroups and then samples one or some of these subgroups is:

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The answer of A sampling method that separates the population...

Question 8

A sampling company that has worldwide capabilities and many different sampling options, such as Internet samples, business-to-business samples, and so on, that was highlighted in Chapter 12 of the textbook is:

Accepted Answer

The sampling company highlighted in Chapter 12 of the textbook is Survey Sampling, which has worldwide capabilities and offers various sampling options such as internet samples, business-to-business samples, and more. The other options (A, C, D, E) are not named in the textbook and therefore cannot be considered the best choice.

Question 9

Which of the following should be most helpful in dividing the sample into different strata?

Accepted Answer

The most helpful basis in dividing the sample into different strata would be a basis that results in different responses across strata. This will ensure that the strata are distinct from one another and will provide more meaningful and reliable results. A basis that results in like responses across strata would not be helpful as it would not allow for meaningful comparisons. The ease of identification and the use of surrogate indicators may be helpful but should not be the primary consideration. The cost should also not be the primary consideration in determining the basis for dividing the sample into different strata.

Question 10

A sampling method that separates the population into different subgroups, and then samples all of these subgroups, is the definition for:

Accepted Answer

The description given in the question matches the definition of stratified sampling, where the population is divided into different subgroups (strata) and samples are taken from each subgroup.

Question 11

Sampling a geographical area using area sampling is:

Accepted Answer

Area sampling is a form of cluster sampling in which the geographical area is divided into smaller clusters, and a random sample of clusters is selected for further analysis.

Question 12

Which of the following is the best definition of cluster sampling?

Accepted Answer

The answer of Which of the following is the best...

Question 13

One of the reasons systematic sampling is faster than simple random sampling is that the population size:

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The answer of One of the reasons systematic sampling is...

Question 14

A survey administered to obtain 40 percent Hispanics and 60 percent Europeans is:

Accepted Answer

Quota sampling is used to ensure that specific subgroups are represented in the sample in the desired proportion. In this case, the survey aims to obtain 40 percent Hispanics and 60 percent Europeans, making quota sampling the most appropriate choice. Referral sampling involves relying on participants to recruit others, convenience sampling involves selecting participants who are easily accessible, judgment sampling involves selecting participants based on a researcher's subjective judgment, and racial sampling is not a recognized sampling method.

Question 15

If a population were not distributed symmetrically, you would use:

Accepted Answer

Stratified sampling allows for the population to be divided into subgroups based on certain characteristics, such as location or age, in order to ensure a more representative sample. This is particularly important when the population is not symmetrically distributed as it allows for more accurate representation of each subgroup.

Question 16

Which of the following may be used to overcome the problems of unlisted and new telephone numbers in a telephone directory?

Accepted Answer

The answer of Which of the following may be used...

Question 17

If we were to ask college students, "To what extent do you value a college degree?" which type of sample plan would be most appropriate?

Accepted Answer

A stratified sample would group the population into the different strata of freshmen, sophomore, junior, and senior, which would capture the expected variation in responses. This would provide a more accurate representation of the overall population and allow for analysis of differences between the strata.

Question 18

One of the nonprobability methods used for sampling is:

Accepted Answer

Convenience sampling is a nonprobability sampling method that involves choosing participants who are easily accessible and available to participate. This method is often used in exploratory research or when time and resources are limited. However, it is important to note that convenience sampling may result in a biased sample and may not accurately represent the population.

Question 19

The purpose of the weighted mean in stratified sampling is:

Accepted Answer

The purpose of the weighted mean in stratified sampling is to provide an overall sample mean that represents all the strata. By assigning weights to each stratum based on its size, the overall weighted mean is calculated, giving equal importance to each stratum's contribution to the sample mean. This helps ensure that the sample mean is representative of the entire population and not skewed by any individual stratum.

Question 20

Simple random sampling is not a wise choice when you have:

Accepted Answer

Simple random sampling can be time-consuming and inefficient when dealing with a large population that is not in electronic format. In such cases, other sampling techniques such as stratified sampling or cluster sampling may be more appropriate. Sampling a smaller population that is not in electronic format may still be feasible with simple random sampling. The sample frame being in electronic format does not necessarily affect the choice of sampling technique.

Quiz 12: Determining How to Select the Sample