Paper 3

Question 1

What is systematic sampling

Advantages and Disadvantages

Answer 1

Samples selected at regular intervals

Easy and covers whole study area equally

However, not all sample sites can be accessed due to vegetation or private land

Question 2

What is random sampling

Advantages and Disadvantages

Answer 2

Random generator method:

Pros:
Least bias method
Can be used in a large sample area or population

Cons:
Representation may be poor if random generating misses large areas

Question 3

What is stratified sampling?

Answer 3

People or places are deliberately chosen according to the area or topic being investigated

Comparisons can be made between subsets

Proportions of subsets need to be known and be accurate

Question 4

How can you measure angle?

Answer 4

Gun clinometer

Question 5

Why is IQR better than the range?

Answer 5

It removes extremes

Question 6

Acronym for describing choropleth maps?

Answer 6

Trend
Examples
Anomalies

Question 7

Method for sediment analysis

Answer 7

Lay a transect from one side of the bay to the other

Systematic Sampling
Sediment type using visual observations
Sediment roundness using the power scale
Pebble size using callipers

Question 8

Acronym for analysing data

Answer 8

Trend
Range
Anomalies
Smallest
Highest