Research Methods Key Terms

0.0(0)
learnLearn
examPractice Test
spaced repetitionSpaced Repetition
heart puzzleMatch
flashcardsFlashcards
Card Sorting

1/58

flashcard set

Earn XP

Description and Tags

3.2.3 Research Methods

Study Analytics
Name
Mastery
Learn
Test
Matching
Spaced

No study sessions yet.

59 Terms

1
New cards

independent variable (IV)

variable that is changed by the researcher to observe its effect in an experiment

2
New cards

dependent variable (DV)

the variable that is measured to see how it is affected by changes in the IV

3
New cards

aim

general statement about the purpose of the investigation

4
New cards

hypothesis

a precise, testable statement about the outcome of an investigation

5
New cards

directional hypothesis

a statement that predicts the outcome of the experiment, including the direction of the change (one-tailed hypothesis)

6
New cards

non-directional hypothesis

a statement that predicts a change but does not state the direction of the change (two-tailed hypothesis)

7
New cards

null hypothesis

a statement that predicts that there will be no change

8
New cards

operationalisation

defining variables to make them as clear and objective as possible

9
New cards

extraneous variable (EV)

any variable other than the IV that could influence the DV

10
New cards

confounding variable

type of EV that varies systematically and could affect the results

11
New cards

demand characteristics

any cue that may inform a participant as to the purpose of the experiment, changing their behaviour

12
New cards

investigator effects

any way that the investigator themself could affect the results; could be due to the experimental design, verbal / non-verbal cues or bias in interpretation of data

13
New cards

participant reactivity

any way in which the participant alters their behaviour as they are aware they are being observed / part of an experiment

14
New cards

randomisation

participants are randomly allocated to experimental conditions; eliminates bias and ensures each participant has an equal chance of being in any condition

15
New cards

standardisation

ensuring all procedures and instructions in an experiment are the same for all participants to maintain consistency (reduces demand characteristics and investigator effects)

16
New cards

ecological validity

the extent to which the results of a study can be applied on real-world settings or reflect real-life behaviour

17
New cards

internal validity

the extent to which an experiment accurately measures what it intends to

18
New cards

Hawthorne effect

a type of participant reactivity where an individual alters their behaviour as they know that they are being observed

19
New cards

social desirability bias

when participants alter their responses / behaviour to be viewed in a better light by others, usually aligning with societal norms

20
New cards

laboratory experiment

the researcher manipulates the IV in a controlled environment, using standardised procedure

21
New cards

field experiment

the researcher manipulates the IV in a real-world setting

22
New cards

natural experiment

the researcher does not manipulate the IV; change is caused by something or someone else

23
New cards

quasi experiment

the IV occurs naturally and cannot be changed (e.g, age or gender)

24
New cards

strengths of laboratory experiments

  • high internal validity

  • experiment can be repeated

  • EVs can be controlled

25
New cards

weaknesses of laboratory experiments

  • lacks generalisability

  • low external validity

  • demand characteristics may be present

  • low mundane realism

26
New cards

strengths of field experiments

  • high mundane realism due to natural environment

  • high ecological validity

27
New cards

weaknesses of field experiments

  • EVs are more likely

  • harder to replicate experiment

28
New cards

strengths of natural experiments

  • high ecological validity

  • can conduct research that would otherwise be considered unethical

29
New cards

weaknesses of natural experiments

  • lacks generalisability due to small sample size

  • cannot randomly allocate participants

  • low internal validity (difficult to prove IV cause the change in DV)

30
New cards

strengths of quasi experiments

  • can be conducted in labs » DV can easily be measured

  • replicable

31
New cards

weaknesses of quasi experiments

  • cannot randomly allocate participants

  • low internal validity (difficult to prove IV cause the change in DV)

32
New cards

sampling

selecting a subset of individuals from the larger population, to study and draw inferences about the entire population

33
New cards

sampling technique

method used to select people from the population

34
New cards

bias (sampling)

occurs when a certain group is under- or overrepresented within the sample group

35
New cards

generalisation

the extent to which findings from an investigation can be applied to the wider population

36
New cards

population

a group of people who are the focus of the researcher’s work, from which a smaller sample is selected

37
New cards

random sampling

every member of the population has the same chance of being chosen (e.g. assigning each participant a number then using a random number generator)

38
New cards

systematic sampling

selecting every nth member of the population (e.g. every 5th person on a register)

39
New cards

opportunity sampling

researcher selects anyone who is willing and available (e.g. waiting on a street)

40
New cards

volunteer sampling

participants select to participate themselves (e.g. answering a postal questionnaire)

41
New cards

stratified sampling

researcher divides the target population into subgroups (strata) based on key characteristics, then randomly selecting participants from each subgroup in proportion to their representation in the population

42
New cards

independent groups

each participant is allocated to a group and participates in one experimental condition » data from each group is independent of the other

43
New cards

repeated measures

each participant completes all conditions » data is related due to individual performance differences

44
New cards

matched pairs

participants are paired up based on variables relevant to the experiment; each half of the pair is randomly allocated to a condition

45
New cards

strengths of independent groups

  • order effects cannot be observed

  • less time-consuming to collect data as experiments can be carried out simultaneously

  • participants less likely to guess aims

46
New cards

weaknesses of independent groups

  • risk of participant variables affecting results, reducing internal validity

  • difficult and time consuming to recruit different participants to each condition

47
New cards

ways to reduce the impact of participant variables in independent groups

  • random allocation of participants to evenly distribute participant variables

  • large sample size

48
New cards

strengths of repeated measures

  • no participant variables » high internal validity

  • fewer participants need to be recruited

49
New cards

order effect

how the sequence of conditions in a repeated measures design affects participant performance

50
New cards

weaknesses of repeated measures

  • risk of order effects impacting the results, as participants may become better or worse at the task with experience

  • high chance participants will figure out the study’s aim » increases demand characteristics

51
New cards

way to reduce order effects

counterbalancing: each group has a different order to complete the conditions in

52
New cards

strengths of matched pairs

  • participants only complete one condition » demand characteristics reduced and no order effects

  • risk of participant variables affecting results is reduced » increases internal validity

53
New cards

weaknesses of matched pairs

  • expensive and time consuming to match up participants

  • difficult to match up participants identically

54
New cards
55
New cards

pilot studies

small scale practice investigations carried out before the full experiment to identify potential issues with the design, method or analysis » allows researches to see if participants guessed the experimental aim (demand characteristics) and if the investigation will have significant results

56
New cards

control groups

group in an experiment treated like the experimental group, but does not receive the tested variable

57
New cards

benefits of having a control group

  • allows for comparison » researcher can determine if the changes in the results (DV) are caused by the treatment (IV)

  • increases internal validity of the experiment

58
New cards

placebo effect

psychological phenomenon where a person’s health or behaviour changes after taking a fake treatment

59
New cards

reasons why placebos are unethical

  • participants believe they are receiving treatment, but are not

  • could deprive participants of effective treatment, potentially causing harm

  • violates ethical guidelines from BPS