Findings of an intervention study with a convenience sample: ...

[V@ndy87]

Findings of an intervention study with a convenience sample:
 
  a. are generalizable to a wider group of patients with related problems.
  b. are to be discounted because they are extremely biased.
  c. provide no useful information.
  d. should be replicated before being applied to a wider population.

Question 2

A person is shopping in the mall and is approached by individuals who identify themselves as researchers for a local food chain.
 
  They ask the person to participate in their study by answering a few questions. As a subject for this survey, the person was selected by which method of sampling?
  a. Convenience sampling
  b. Purposive sampling
  c. Random sampling
  d. Systematic sampling

[Juro]

Answer to Question 1

ANS: D
Representativeness of the sample is a concern in convenience sampling, and generalizability is therefore limited.
In a convenience sample, representativeness of the sample is a concern, and generalizability is therefore limited.
Not all studies with a convenience sample are more biased than studies with other sampling methods.
Intervention studies with a convenience sample can certainly provide useful information, even though further testing might be needed to be able to apply the findings to a large population.

Answer to Question 2

ANS: A
In convenience sampling, subjects are included in the study merely because they happened to be in the right place at the right time.
Purposive sampling is a method used in qualitative research where the researcher seeks out particular subjects because of their characteristics. In convenience sampling, subjects are included in the study merely because they happened to be in the right place at the right time.
Only persons in the mall had any chance of becoming a subject in this studythe sample is not a random one. In convenience sampling, subjects are included in the study merely because they happened to be in the right place at the right time.
Systematic sampling is a form of probability sampling used when an ordered list of all members of the population is available. In convenience sampling, subjects are included in the study merely because they happened to be in the right place at the right time.