sampling methods

Question 1

opportunity

Answer 1

• easily available people
• agree to take part

Question 2

pros and cons of opportunity

Answer 2

+ easy and quick
- certain subgroups not be available therefore bias

Question 3

volunteer

Answer 3

• people who have self selected and volunteered
• approached the researcher

Question 4

pros and cons of volunteer

Answer 4

+ quick and easy
- biased (only motivated people will volunteer)

Question 5

Random sampling

Answer 5

All members of target population have equal chance of being selected w.g names in a hat.

Question 6

Random sampling

Answer 6

All members of target population have equal chance of being selected w.g names in a hat.

Question 7

Pros and cons of random sampling

Answer 7

+ usually representative as everyone has equal chance .
- time consuming and some participants may refuse .

Question 8

Systematic sampling

Answer 8

A pre determined system of rule e.g select every 2nd,4th,6th from a list

Question 9

Pros and cons of systematic

Answer 9

+creates less bias sample .
-still chance of being biased e.g all girls could be selected .

Question 10

Stratified sampling

Answer 10

Identifies sub groups , participants randomly selected from sub groups to represent their group.

Question 11

Pros and cons of stratefied

Answer 11

+representative as theirs equal proportions of people from each sub group.
-difficult and time consuming .