CMST300 Exam 3 Chapters 9 & 11
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Response is influenced because you're being observed
Participants changing during process of experiment
A difference (sex, major, etc.) in the groups of people.
Something going on between the subjects.
Eg. Students in 10a class telling students in 11a class about test.
Group deprived on stimulus will work harder because they know they have to over come something.
Opposite of compensatory rivalry, they just give up and don't try to do better.
Involves a researcher or a confederate who is aware of the study's purpose, variables and hypotheses, this individual could unconsciously threat participants differently in the carious conditions of the study.
The researchers' knowledge of the research study's purpose, variables and hypotheses biases their observations of the dependent variable in some way.
Researcher attribute effect
When some characteristic or feature of the researcher systematically affects the participant responses in a study.
Researcher related threats (three listed)
Experimenter threats, observer bias, researcher attribute effect
People learning from the test
Results of a study could be the result of current events that take place while the experiment is being conducted.
If the instrument changes from the first measurement to the second.
Outside variable manipulated results. Eg. Increase in ice cream sales and violence.
pre-post test, people regress to the statistical average
When group deprived of a stimulus given something else to make up for it, that something is a manipulation
little control, NO random assignment, IV manipulated or observed.
Some control, assignment by pretest or naturally occurring groups, IV observed (field)
Involves 2 key elements: RANDOM assignment of participants, experimental and control groups.
Pre-experimental experiment types (listed)
- One-shot case study
- One group pre-test/post-test design
- Static Group Comparison
One-shot case study
One group pretest-posttest
Static group comparison
- Group A--> Manipulation-->Postttest
- Group B----------------------> Post test
Nonequivalent Control Group Design
Pretest group A->manipulate->posttest group b
pretest group A-------->posttest
Eg. being scared after watching pll, fear goes down over time.
Multiple series design
SAA only B, no manipulation
pretest-posttest control group design
random grpB--pretest-------------------post test
posttest only control group design
- random grpA--mani--posttest
- random grpB-----postttest
Process of converting data into numerical form
A document that describes the locations of variables and lists the code assignments to the attributes composing those variables.
useful because matches variables with a description, tells us what our variables were and how we quantified them.
a way to summarize a large set of data
how far values are distributed around the mean, based on theoretical distribution
high values tend to appear with less frequency than a normal curve
low values tend to appear with less frequency than in a normal curve
the height of the "middle peak" of the curve
What would you like to do?
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