Question 1

One indication of homogeneity within strata is the

Accepted Answer

A)   size of the stratum's sample mean.
B)   size of the overall sample mean.
C)   number of elements within each stratum.
D)   weights used to calculate the overall variance of estimate.
E)   size of the standard error of estimate by stratum. E

Question 2

A researcher wants to interview members of the junior class in a local high school that are interested in attending______________ the local university in order to investigate their attitudes concerning the university's admissions policy. Although the researcher suspects that many of the juniors are interested in attending, the researcher cannot get a list of juniors but only has the names of the three students that have expressed their interest by writing to the admissions office. What sampling procedure should the researcher use to assemble a sample of adequate size?

Accepted Answer

A)   Simple random sampling
B)   Referred sampling
C)   Snowball sampling
D)   Convenience sampling
E)   Quota sampling C

Question 3

Drawing a simple random sample depends mainly on having a good______________.

Accepted Answer

sampling frame

Question 4

The distinguishing feature of probability samples is that

Accepted Answer

A)   they involve personal judgment somewhere in the selection of sample elements.
B)   each population element has an equal chance of being included in the sample.
C)   each population element has an equal chance of being included in the sample and every combination of n population elements is a sample possibility.
D)   each population element has a known chance of being included in the sample.
E)   they will always be more representative of the population than nonprobability samples.

Question 5

Which of the following is NOT a problem with using a phone book for a sampling frame?

Accepted Answer

A)   Unlisted phone numbers.
B)   Not all homes have phones.
C)   Double counting homes with multiple phone numbers.
D)   The phone book is always outdated.
E)   All of the above are problems when sampling from phone books.

Question 6

If a newspaper editor asks a reporter to interview thirty males and thirty females from each of three geographical areas of a particular city for a prospective story, what type of sampling procedure is being used?

Accepted Answer

A)   Simple random sample
B)   Convenience sample
C)   Quota sample
D)   Systematic sample
E)   Stratified sample

Question 7

All of the following are probability sampling plans EXCEPT

Accepted Answer

A)   quota.
B)   area.
C)   cluster.
D)   simple random.
E)   systematic.

Question 8

One of the major problems with mail surveys is nonresponse bias. In an effort to minimize this, a researcher decides to limit the sample to his personal friends from whom he is sure to get replies. This is an example of a

Accepted Answer

A)   probability sample.
B)   nonprobability sample.
C)   random sample.
D)   sequential sample.
E)   quota sample.

Question 9

In simple random sampling, every population unit has an equal chance of being chosen.

Accepted Answer

A) True 
 B)False

Question 10

A researcher divides the population of the purchasers of Brand X into heavy and light users. He then chooses a random sample independently from each group. This is an example of______________sampling.

Accepted Answer

A)   nonprobability
B)   random
C)   judgmental
D)   stratified
E)   quota

Question 11

Which of the following are advantages of stratified over simple random sampling?

Accepted Answer

A)   Ensures adequate representation from each stratum of interest.
B)   Can produce more precise sample statistics.
C)   Allows for the comparison of variables between strata.
D)   Takes advantage of homogeneity within groups.
E)   All of the above.

Question 12

Judgment samples are best used for

Accepted Answer

A)   causal research.
B)   exploratory research.
C)   hypothesis testing.
D)   descriptive research.
E)   experimental designs.

Question 13

Andy was a senior in college majoring in marketing. He received a call to participate in a survey on behalf of a company that was targeting graduating seniors. At the end of the survey, Andy was asked for the name of a friend who was also a senior in marketing. This is an example of a "snowball" sample.

Accepted Answer

A) True 
 B)False

Question 14

The closer we need an estimate to be to the true population, the______________the sample that will be required, all else equal.

Accepted Answer

The answer of The closer we need an estimate to...

Question 15

Snowball samples are an example of

Accepted Answer

A)   convenience sampling.
B)   judgment sampling.
C)   quota sampling.
D)   simple random sampling.
E)   stratified sampling.

Question 16

The primary advantage of area sampling plans is

Accepted Answer

A)   area sampling data is easy to tabulate and analyze.
B)   they don't require probability-based methods of element selection.
C)   results can be generalized from one area to another without loss of statistical efficiency.
D)   they don't require a list of elements from the population of interest.
E)   the results are more understandable for the general public than other, more complex plans.

Question 17

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

Accepted Answer

A)   Any probability sampling plan would be useful.
B)   A stratified sample because we would expect the answers to vary by strata: freshmen, sophomore, junior, and senior.
C)   A cluster sample because we would expect the answers to vary by cluster: freshmen, sophomore, junior, and senior.
D)   An area sample because we would expect the answers to vary by area: freshmen, sophomore, junior, and senior.
E)   None of the above would be appropriate. In fact, it would be best to use a nonprobability sampling technique.

Question 18

A(n)______________sample is a nonprobability sample chosen so that the proportion of sample elements with certain characteristics is about the same as the proportion of the elements with the characteristics of the target population.

Accepted Answer

The answer of A(n)______________sample is a nonprobability sample chosen so...

Question 19

Calculation of the sampling interval is important in which sampling plan?

Accepted Answer

A)   Simple random sample
B)   Systematic sample
C)   "Skip" sample
D)   Cluster sample
E)   Convenient sample

Question 20

Which of the following statements is TRUE?

Accepted Answer

A)   In cluster sampling, the parent population is broken into mutually exclusive and exhaustive subgroups and a simple random sample is selected from each subgroup.
B)   Cluster samples are most statistically efficient when the clusters are internally homogeneous.
C)   In order to yield high statistical efficiency, each cluster in a cluster sample should include as many diverse universe values as possible.
D)   One of the main advantages of cluster sampling over simple random sampling is its greater statistical efficiency for the same size sample.
E)   All of the above statements are false.

Exam 14: Developing the Sampling Plan