Psychology- Sampling
- Created by: Daisymac
- Created on: 16-01-19 16:17
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- Sampling
- What?
- A sample is a group of people who take part in a research investigation.
- Random sample
- In which all members have an equal chance of being selected .
- List of all people form target population and the names are assigned a number and the sample is generated through a lottery method
- Strengths- free from researcher bias as they have no influence over who is selected and prevents them from choosing people who they think will support their hypothesis
- Weaknesses- Time consuming as you have to get a full list of target population and is extremely difficult to obtain. May be unrepresentative and some may refuse to take part
- Systematic sampling
- When every nth member of a target population is selected. A sampling from is produced where there is a list of people in alphabetical order and every , for example, 3rd person is picked
- Strength- avoids researcher bias and is fairly representative
- Weaknesses- same as random
- Stratified sample
- The composition of the sample reflects the proportions of people in certain sub groups within the population
- Strengths- Avoids researcher bias. Highly representative and so generalisations are possible
- Weaknesses- Stratification is not always perfect and so complete representation is not possible. Also VERY time consuming
- Opportunity sampling
- Researcher takes the chance to ask whoever is around at the time of their study
- Strengths- Convenient. Saves time and effort.
- Weaknesses- Unrepresentative as they are drawn from very specific ares. Also there is researcher bias
- Volunteer sample
- Involves participants selecting themselves to be part of the sample
- Strengths- easy and requires minimal input from the researcher.
- Weaknesses- Volunteer bias as it may attract a certain profile of person
- What?
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