Geographical investigation Flashcards
What are the three phases of fieldwork of Geographical Investigation (GI)?
Pre-fieldwork, fieldwork, post-fieldwork phase.
What do you do for the pre-fieldwork phase?
Analyse the GI question.
What do you do for the fieldwork phase?
Gathering data
What are the three steps during the post-fieldwork phase?
- Representing data
- Writing conclusion
3.Reflection and evaluation
What is the meaning of sampling?
Sampling is the process of selecting individuals from a population or choosing a smaller group which has similar characteristics that represent the entire population.
Why do we need to use sampling?
Sampling is done as it is impossible and impractical to collect information from the whole population and there are also limitations on time and resources.
How many sample size is required?
A sample size of at least 30 is preferred in order to conduct a real sable analysis of the data.
What is probability sampling?
Probability sampling means that samples are randomly selected, without the researcher’s conscious decision.
This can be done using a random number generator.
Has a greater chance of creating a representative sample.
What is Non-probability sampling?
Samples are non-randomly selected, meaning that the researchers subjectively selects samples, such as family or close friends.
Samples are unlikely to be representative as the selection is likely to be biased.
When is probability sampling use?
It is used when you need a more representative sample.
When is non-probability sampling use?
It is used when it is unnecessary or impractical to select a representative sample, and when sample needs to be conducted quickly due to time constraints.
What are the two examples/types of probability sampling?
Simple random sampling and stratified random sampling.
What is simple random sampling?
- Decide on the desired sample size (e.g. 10)
- Assign a number to every member of the population being sampled (e.g. 1-100)
- Use a random number generator to generate random numbers until the desired sample size is reached (e.g. 42,10,9,72,88,14, etc.)
- Select the sample using the random numbers
What is stratified random sampling?
- Decide on the desired sample size
- Identify the makeup the population according to the relevant sub-group (e.g. of percentage of male/female?)
- Calculate how many individuals need to be selected from each sub-group of the population (the ratio needs to be PROPORTIONATE)For Stratified sampling, a proportional percentage of samples are selected using random sampling
- Use a random number generator to select the individuals to form the sample within each sub-group
What is convenience sampling?
Carried out in an ad hoc manner that is the most accessible to the researcher
Select any members of the population who are conveniently and readily available.
E.g. giving out a questionnaire survey to the 1st 100 people outside the train station on a Saturday morning.