Sampling

Question 1

what is opportunity sampling?

Answer 1

paprticiaptns happen to be available at the time.

Question 2

What are the strengths to opportunity sampling?

Answer 2

easy method to recruit which saves time and money.

Question 3

What are the limitations of Opportunity sampling?

Answer 3

1. Not representative to the whole population. 2. Researcher bias is presented as they control who they want to select.

Question 4

What is random sampling?

Answer 4

when all of the members of the population have the same chance of being selected.

Question 5

What are the advantages to random sampling?

Answer 5

No researcher bias.

Question 6

What are the disadvantages of random sampling?

Answer 6

Time consuming to pick, volunteer bias when they refuse to take part so could be unrepresentative.

Question 7

What is systematic sampling?

Answer 7

Used whereby every nth member is selected from the sampling frame.

Question 8

What are the advantages to systematic sampling?

Answer 8

Avoids researcher bias and usually fairly representative.

Question 9

What are the disadvantages to systematic sampling?

Answer 9

Not truly unbiased.

Question 10

What is stratified sampling?

Answer 10

The composition of the sample reflects the varying proportions of people in particular subgroups within the wider population.

Question 11

What are the advantages to stratified sampling?

Answer 11

1. No researcher bias.
2. Produces Representative data due to the proportional strata.

Question 12

What are the disadvantages of stratified sampling?

Answer 12

1. Time consuming.
2. A complete representation of the target population is not possible as the identified strata cannot reflect all the differences between the people of the wider population.

Question 13

What is volunteer sampling?

Answer 13

Involves self selection whereby the participant offers to take part either in response to an advert or when asked to.

Question 14

What are the advantages to volunteer sampling?

Answer 14

1. Quick access to ppts therefore is easy and not time consuming.
2. As people volunteered they are more likely to take part in the study.

Question 15

What are the disadvantages to volunteer sampling?

Answer 15

1. May attract a certain type of person - volunteer bias.
2. Motivation like money could lead to ppts not taking things seriously.