PRC Sampling Techniques & Participant Recruitment 3

Question 1

A market research firm needs 100 completed interviews and assigns interviewers to recruit specific numbers of men and women in each age bracket. This describes:

Accepted Answer

Quota sampling

Answer

Quota sampling sets predetermined targets for subgroup representation and allows interviewers to recruit non-randomly until quotas are filled.

Question 2

When calculating the minimum sample size, increasing the desired confidence level from 90% to 95% will:

Accepted Answer

Increase the required sample size

Answer

A higher confidence level requires a larger critical value (z-score), which increases the calculated minimum sample size needed to achieve that confidence.

Question 3

In a multistage sampling design, which sequence correctly describes the process?

Accepted Answer

Select clusters, then subgroups, then individuals

Answer

Multistage sampling progressively narrows selection from larger units (e.g., counties) to intermediate units (e.g., schools) to final units (e.g., students).

Question 4

Which participant recruitment method poses the greatest risk of self-selection bias?

Accepted Answer

Opt-in online surveys

Answer

Opt-in online surveys attract only those who choose to participate, systematically overrepresenting people with strong opinions or high interest in the topic.

Question 5

A design effect (DEFF) greater than 1.0 in cluster sampling indicates:

Accepted Answer

The variance is larger than under simple random sampling

Answer

A DEFF > 1.0 means that clustering increases variance compared to SRS, requiring a larger sample to achieve the same precision.

(PRC) Professional Researcher Certification Practice Test

(PRC) Professional Researcher Certification Practice Test

PRC Sampling Techniques & Participant Recruitment 3