Research Methods - Sampling Techniques Flashcards

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1
Q

Target population

A
  • group researchers are studying and want to generalise their results to
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2
Q

What are sampling techniques used for?

A
  • obtain sample of target population = avoid studying entire population = long + expensive
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3
Q

Sample

A
  • should be representative of the population
  • should have same characteristics as population
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4
Q

Random sampling

A
  • every member of target population has the same chance of being selected
    E.g. random name generator
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5
Q

Random sampling adv = large

A
  • if target population is large + large sample is drawn = likely sample is representative = results can be generalised to the target population
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6
Q

Random sampling adv = bias

A
  • no researcher bias selecting the sample
  • sample chosen by chance = no conscious choice from researcher
  • equal chance for everyone
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7
Q

Random sampling dis = difficult

A
  • sometimes difficult to get full details of a target population from which to select a sample
    E,g,not possible to get a full list of all women in the uk
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8
Q

Random sampling did = willing

A
  • not all members of target population who are selected will be available or willing to take part = unrepresentative sample
  • sample size reduced if people refuse to take part
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9
Q

Systematic sampling

A
  • participants are selected by taking every Nth person from a list
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10
Q

Systematic sampling adv

A
  • simpler than random sampling = only requires a list of the target population + researcher decides to select every nth person.
  • less effort
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11
Q

Systematic sampling dis = hidden periodic trait

A
  • process of selection can interact with a hidden periodic trait within the population = not representative
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12
Q

Systematic sampling dis = willing

A
  • not all members of target population who are selected will be available or willing to take part = unrepresentative sample
  • sample size reduced if people refuse to take part
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13
Q

Stratified sampling

A
  • classifying population into categories + randomly choosing sample that consists of participants from each category in the same proportions as they are in the population
  • representative sample
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14
Q

Stratified sampling adv

A

all groups within a population are included = representative

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15
Q

Stratified sampling dis

A
  • very time consuming = categories have to be identified and calculated
  • struggle if you don’t have all the details of people in your target population
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16
Q

Opportunity sampling

A
  • ## selecting participants who are readily available and willing to take part = convenience sampling

Psychologists might have easy access to a group of people that they know well or have regular contact with. It might therefore be convenient to approach these people to ask them to take part in their research.

17
Q

Opportunity samplig adv

A
  • easiest + most practical method of ensuring large samples
18
Q

Opportunity sampling dis

A
  • high chance sample isn’t representative
  • people may feel obliged to take part in research even if they don’t want to = unethical
19
Q

Volunteer sampling

A
  • people volunteer to participate in study
  • researcher will usually advertise for people to take part e.g. leaflets, posters, radio or tv broadcasts
    -people take notice of the information and can then decide if they would like to take part in the research and volunteer their time.
20
Q

Volunteer sampling adv

A
  • saves research time + effort
  • researcher only makes advertisements then waits for participants to come to them + volunteer time and involvement
21
Q

Volunteer sampling disadv

A
  • certain people volunteer (enthusiastic, interested in topic) = high chance of unrepresentative sample that doesn’t reflect target population
22
Q

What is a pilot study?

A

-initial run-through of the procedures to be used in an investigation; it involves selecting a few people and trying out the study on them

23
Q

What do you save with a pilot study?

A

Time, money

24
Q

How do pilot studies help?

A
  • help spot any ambiguities or confusing in the information given to participants or problems with the task devised
25
Q

Floor effect pilot study

A
  • task is too hard
  • none of the participants can score at all or can complete the task – all performances are low.
26
Q

Ceiling effect pilot study

A

task is so easy that all achieve virtually full marks or top performances

27
Q

When using self-report measures it is important to check as part of the pilot study

A

The participants understand the questions and are prepared to answer them
That closed questions offer suitable options
Whether open questions are also needed to elicit unpredictable responses
Whether the reporting method is appropriate, e.g. if a face-to-face interview is too intimidating should it be changed to a questionnaire?

28
Q

In observations it is important to check

A

Observers agree on operational definitions of behavioural categories
Inter-observer reliability – do the researchers need practice observing the behaviours? The behavioural categories include all the important behaviours
The behavioural categories do not overlap
Whether the participants are affected by the observers – should they be covert?