Types of method

Question 1

Advantages of random?

Answer 1

• avoids human choice - reducing sampling bias
• fair representation – all areas have equal chance of being selected

Question 2

Disadvantages of random?

Answer 2

• may lead to poor representation of overall parent population - leaves gaps
• practical contstraints in terms of time and problems to access certain parts of study area

Question 3

Advantages of systematic?

Answer 3

• accurately reflects continuous changes in variables by ensuring good coverage of area - shows patterns
• ensures fairly even coverage of area when collecting data

Question 4

Disadvantages of systematic?

Answer 4

• can miss anomalies and leave sampling gaps as not all points have equal chance of being selected
• therefore, data may not be fully representative of the area

Question 5

Advantages of stratified?

Answer 5

• accurately reflects population being studied as researches are stratifyiing the entire population - ensures each subgroup within poplulation receives proper representation within sample

Question 6

Disadvantages of stratified?

Answer 6

• requires good prior knowledge of area
• proportion of subsets must be known otherwise results will possibly be bias