Sampling

Question 1

What should you consider when sampling?

Answer 1

If Representative:
can be generalised to target market

Bias:
Did reasercher influence sample?

Time taken:
Is it quick or efficient?

Ease of Sampling:
Is ot easy to find them? Will they refuse?

Question 2

Explain random sampling

Answer 2

= Each member has an equal chance eg out a hat

+ fair/ equal
+ can be representative

• difficult
• time comsuming
• unrepresentative (chance)

Question 3

Explain systematic sampling

Answer 3

= every nth member of target pop is selected.

+ free from bias
+ fairly representative

• time consuming
• difficult

Question 4

Explain stratified sampling

Answer 4

= subgroups in target pop identified and proportions to be representative are worked out.

+ free from researcher bias
+ representative (maths)

• difficult
• time comsuming
• selected PPTS nay refuse

= x / total × 100 = %

Question 5

What is opportunity sampling?

Answer 5

= researcher takes chance to ask those willing and available

+ saves time
+ saves money

• not representative
• researcher bias

Question 6

What is volunteer sampling

Answer 6

= advert put out, individuals select themselves to participate.

+ saves time
+ convenient

• volenteer bias
• not representative