Research Methods exam 1

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Psychology

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69 Terms

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Empiricism
using evidence from the senses or from instruments that assist the senses as the basis for conclusions
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basic research
research done to enhance the general body of knowledge
◦E.g., measuring motivations in depressed v. non-depressed individuals
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translational research
uses findings from basic research to develop and test applications
◦E.g., developing a therapy for depression that affects motivation
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applied research
research done with a practical problem in mind.
E.g., developing new therapy for depression
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theory
a set of statements that describes general principles about how variables relate to one another
e.g., What is the link between violent video games and aggression?
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hypothesis
a way of stating the specific outcome the researcher expects to observe if the theory is accurate
(PREDICTION)
◦e.g., Playing a violent video game will increase subsequent aggression
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3 features of a good theory
- supported by data
- falsifiable
- parsimonious
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Parsimony (Occam's Razor)
the simplest explanation is the best
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Falsifiability
Can the claim be disproved?

- theories are often unfalsifiable
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Why is proof impossible? If we cannot prove, then what do we do in science?
we never actually 'prove' anything
◦Our theories can only be consistent with the data (or 'not yet falsified')

A scientific view of the world simply represents the weight of converging evidence
◦Given the data, what is most likely to be correct
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Scientific method
A series of steps followed to solve problems including collecting data, formulating a hypothesis, testing the hypothesis, and stating conclusions.
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Theory-Data Cycle
theory, research questions, research design, hypothesis, data
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Personal experience
relying on personal experience can lead us to erroneous conclusions
- lack of comparison groups
- probabilistic
Ex: working out clears my head

Confounds- other factors which may have caused a change in your outcome of interest
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intuition
◦We tend to reinforce our previously-held ideas
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authority
◦Authority figures are subject to the same biases produced by personal experience and intuition that we are

ex; learning styles
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How do confounds and comparison groups affect these sources of information

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What is meant by real-world events being probabilistic?
findings will not explain all individuals all of the time- only on average
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Good-story heuristic
if it sounds plausible, believe it
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availability heuristic
we judge the likelihood and frequency of an event by the ease with which relevant examples come to mind
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confirmation bias
we seek out and attend to evidence that confirms our beliefs, but ignore evidence that contradicts them
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confirmatory hypothesis testing
the tendency to ask only the questions that will lead to the expected answer
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empirical scientific thinking
based on actual data, not just intuition or personal experience
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objective scientific thinking
◦utilizes clearly defined methods that allow others to collect and evaluate the same data
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systematic scientific thinking
observations are structured so that they can speak directly to the issue being evaluated
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variable levels
nominal, ordinal, interval, ratio
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measured variable
a variable that is being observed/recorded
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manipulated variable
: a variable that is directly under the control of the researcher
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independent variable
variable that is manipulated
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dependent variable
The outcome factor; the variable that may change in response to manipulations of the independent variable.
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operational definition
defines a concept by stating precisely how the concept is measured and/or manipulated in a particular study
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frequency claim
describe a particular rate or level of a single variable

Ex: 10% of Americans regularly exercise
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association claim
state that one variable is associated with another variable
ex; aggression is higher during the warmer months
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causal claim
states that one variable is responsible for/caused changes in another variable

ex: alcohol consumption impairs motor skills
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Positive correlation
two variables change in the same direction, both becoming either larger or smaller
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negative correlation
as one variable increases, the other decreases
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no association
when the points in a scatter plot do not have any pattern
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construct validity
umbrella term to determine if the underlying, unobservable psychological entity is actually being measured.
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4 big validities
construct, external, statistical, internal
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Type 1 error
false positive
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type 2 error
false negative
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3 criteria for causality\********
covariance, temporal precedence, internal validity
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ethical issues of the Milgram Obedience Study
-extreme stressful to teacher participants
- some experienced long-term guilt after being debriefed
- balanced potential risk to participants and the value of knowledge
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ethical issues of the Tuskegee Syphilis experiment
human subjects werent treated respectfully, harmed, members of disadvantaged group
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Belmont Report
Purpose was to discuss ethical principles researchers should follow
◦Called partly in response to Tuskegee study
Provided three main guiding principles for research:
1.Respect for Persons
2.Beneficence
Justice
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additional ethical principles by the APA
IRB- Institutional Review Board
- informed consent
- deception
-debriefing
- data fabrication and falsification
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Anonymous vs confidential data
◦Anonymous—researchers do not collect any information that could be used to identify (e.g., name, birthdate)a participant

◦Confidential—researchers collect some information that could be used to identify (e.g., name, birthdate) a participant, but they prevent its disclosure
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informed consent
◦Researcher must explain the study to participants in everyday language and give them a chance to decide whether to participate.
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deception
Researchers withhold some detail(s) of the experiment through omission or commission:
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Debriefing
◦Describe the nature of the deception and why it was necessary
◦Always provided in studies with deception
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data fabrication
◦Researcher invents/creates data that fits hypotheses
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data falsification
◦Researcher influences study results by:
◦Selectively deleting data
◦Influencing participants to behave in hypothesized way
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observational measure
◦Recording observable behaviors or physical traces of behaviors
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physiological measures
◦Recording biological data such as brain activity, hormone level, or heart rate
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self-report measures
◦Recording responses to ratings scales, questionnaires, and/or interviews
Multiple rates possible for same question
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scales of measurement
nominal(names, ex: eye colors, religions) , ordinal, interval, ratio
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categorical variable
levels are categories
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quantitative/continuous variable
levels are coded with meaningful numbers along a continuum.
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3 types of quantitative variables
ordinal- order (1st, 2nd, level of education
interval- equal intervals (temperature, IQ)
ratio- Zero means something, height weight
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Reliability
how consistent the results of a measure are.
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Validity
whether the operationalization of a construct is measuring what it is supposed to measure
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relationship between reliability and validity
possible to be reliable and not valid

not possible to be valid and not reliablfe
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test-retest reliability
simply involves measuring the same individuals twice and correlating their scores
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interrater reliability
reliability focuses on whether two individuals use the operational definition the same way
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internal reliability
focuses on whether people give consistent responses to the test
uses cronbachs alpha
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5 types of construct validity
1.Face validity
2.Content validity
3.Criterion validity
4.Convergent validity
Discriminant validity
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Which of the types of construct validity are subjective and which are empirical?
subject: face and content
empirical; convergent, criterion, and discriminant
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convergent validity
asks whether a measure is correlated with measures of similar constructs
◦E.g., Does a measure of intelligence correlate with other aptitude measures (e.g., Stanford-Binet vs. Wonderlic)
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discriminant validity
asks whether a measure is correlated with measures of dissimilar constructs
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external validity
extent to which we can generalize findings to real-world settings