Question 1

A sample is always a good representation of the target population.

Accepted Answer

A sample can be representative of the population if it is selected using proper sampling techniques and the sample size is large enough. However, there is always a degree of sampling error or bias, so a sample may not always perfectly represent the population.

Question 2

________ results from the exclusion of certain groups of subjects from a population frame.

Accepted Answer

The answer of ________ results from the exclusion of certain...

Question 3

A convenience sample is a type of probability sample.

Accepted Answer

A convenience sample is a type of non-probability sample, where individuals are chosen based on their availability and willingness to participate, rather than through a random selection process.

Question 4

Coverage error results in a ________.

Accepted Answer

The answer of Coverage error results in a ________....

Question 5

Sampling error can be reduced by taking larger sample sizes.

Accepted Answer

This is true, as larger sample sizes make the sample more representative of the population, reducing the potential for random errors to affect the results.

Question 6

________ results from the failure to collect data on all subjects in the sample.

Accepted Answer

The answer of ________ results from the failure to collect...

Question 7

To gather opinions on the efficacy of U.S. foreign policies, a sample of 50 faculty members is selected from the pool of university professors who have taught political science at the graduate level. This is an example of a judgment sample.

Accepted Answer

A judgment sample is a nonprobability sample type in which the sample is selected based on the judgment of the researcher or some other knowledgeable person. In this case, the researcher selected the sample based on the judgment that university professors who have taught political science at the graduate level would have relevant opinions on U.S. foreign policies.

Question 8

The sampling process begins by locating appropriate data sources called ________.

Accepted Answer

The answer of The sampling process begins by locating appropriate...

Question 9

Systematic samples are less efficient than stratified samples.

Accepted Answer

Stratified sampling divides the population into homogeneous subgroups and samples each subgroup, which can lead to more precise estimates compared to systematic sampling that selects every nth item, potentially missing variations within subgroups.

Question 10

There can be only one sample drawn from a population.

Accepted Answer

A sample is a subset of a population and multiple samples can be drawn from the same population.

Question 11

To estimate the average number of hours a student at a major university spent in the library, a researcher obtained the list of students from the registrar's office, from which she can draw a random sample 200 students. This list is a ________.

Accepted Answer

The answer of To estimate the average number of hours...

Question 12

Items or individuals in a judgment sample are chosen with regard to their probability of occurrence.

Accepted Answer

In a judgment sample, items or individuals are selected based on the knowledge and expertise of the researcher, rather than their probability of occurrence. This method is often used in situations where it is difficult or impossible to obtain a random sample.

Question 13

If you randomly select a student from the first row of a business statistics class and then every other 5 students thereafter until you get a sample of 20 students, this is an example of a convenience sample.

Accepted Answer

This is an example of systematic sampling, not convenience sampling. In systematic sampling, you select every nth individual from a list or sequence.

Question 14

An electronic appliance chain gathered customer opinions on their services using the customer feedback forms that are attached to the product registration forms. This is an example of a convenience sample.

Accepted Answer

A convenience sample is a non-random population sample where individuals are selected based on their availability and willingness to participate. In this case, the electronic appliance chain only gathered customer opinions from those who filled out the attached feedback forms, which were conveniently available to those customers who also registered their product. Therefore, this is an example of a convenience sample.

Question 15

Sampling error can be completely eliminated by taking larger sample sizes.

Accepted Answer

Sampling error cannot be completely eliminated by taking larger sample sizes, although it can be reduced. Other factors that can influence sampling error include the representativeness of the sample and the variability of the population being sampled.

Question 16

In a business statistics class where students sit randomly without particular preferences. A sample is selected by including everybody who sits in the first row. This is an example of a cluster sample.

Accepted Answer

The answer of In a business statistics class where students...

Question 17

Using different frames to generate data can lead to totally different conclusions.

Accepted Answer

Different frames can highlight different aspects of the same data, leading to different interpretations and conclusions.

Question 18

The professor of a business statistics class wanted to find out the average amount of time per week her students spent studying for the class. Among the 50 students in her class, 20% were freshmen, 50% were sophomores and 30% were juniors. She decided to draw 2 students randomly from the freshmen, 5 randomly from the sophomores and 3 randomly from the juniors. This is an example of a systematic sample.

Accepted Answer

This is not an example of a systematic sample. The professor is using a combination of stratified and cluster sampling methods.

Question 19

When participants are allowed to self-select into the sample, you have a nonprobability sample.

Accepted Answer

When participants self-select, they are not randomly chosen from the population and therefore the sample is not a probability sample.

Question 20

You stand at the main entrance to a departmental store and pick the first 20 customers that enter the store after it has opened its door for business on a single day. This is an example of a systematic sample.

Accepted Answer

This is an example of a convenience sample because the selection of the first 20 customers is based on ease of access and timing, rather than a systematic method of selecting every nth customer.

Quiz 7: Sampling and Sampling Distributions