non-random sampling 1.3

Question 1

what are the two types of random sampling

Answer 1

• quota sampling
• opportunity sampling

Question 2

How to carry out: quota sampling

Answer 2

• the population is divided into groups according to characteristics. A quota of items / people in each group is to try and reflect the group proportion in the whole population.

—> interviewer sets actual sampling units

Question 3

Advantages of quota sampling

Answer 3

• Allows a small sample to still be
  representative of the population
  *No sampling frame required
• Quick, easy and inexpensive
  *Allows for easy comparison between different groups within a population

Question 4

Disadvantages of quota sampling

Answer 4

*Non-random sampling can introduce bias
* Population must be divided into groups,
which can be costly or inaccurate
* Increasing scope of study increases number of groups, which adds time and expense
*Non-responses are not recorded as such

Question 5

How to carry out: Opportunity sampling

Answer 5

• Sample is taken from people who are available at time of study, who meet criteria

Question 6

Advantages of opportunity sampling

Answer 6

• Easy to carry out
• Inexpensive

Question 7

Disadvantages of opportunity sampling

Answer 7

*Unlikely to provide a representative sample
*Highly dependent on individual researcher