Final Exam Flashcards
The process of selecting observations that will be analyzed for research purposes
Sampling
Homogeneous
Having the same specific characteristics of study
Heterogeneous
Having diverse characteristics of study
What is good about a heterogeneous sample versus a homogeneous one?
Ensures that the sample reflects the variability in the population
The cluster of people, events, things, or other phenomena in which you are interested
Population
The cluster of people/events from or about which you will actually gather data
Sample
Tell me about probabilistic sampling
statistically representative sample
Used with a well-defined population
Enables generalization from sample to populations
Representative sample
Random selection
What is a representative sample?
A sample that resembles the population in all the important ways
Sampling error
Degree to which your sample deviates from the population’s characteristics
Sampling error is due to _____ or ____
random error
Systematic error
The bigger the sample, the _____ the error
smaller
Tell me about simple random samples
Sampling frame
RNG
Sampling frame
Lists every member of the population
Tell me about systematic sampling
Sampling frame
Every kth person
Watch out for periodicity
Periodicity
The tendency for a pattern to occur at regular intervals
Tell me about stratified sampling
Divide population into relevant subgroups
Draw sample from each group
Good for cyclical
Proportional versus disproportionate stratification
Proportional stratification
Each subgroup has the same sampling fraction
Disproportional stratification
Size of subgroup is not necessarily proportionate to population size of group
Tell me about cluster sampling
Samples groups and selects elements from each heterogenous group
Sampling done in stages
Non-probability sampling techniques
A person’s likelihood of being selected for membership in sample is unknown
May not represent the population
Qualitative
Types: Purposive, Snowball, Quota, and convenience
Purposive sample
Begin with specific perspectives, then seek out participants who cover them
Snowball sample
Participants help find more participants
Quota sample
Identify category with some variation
Subgroup for each category
Researcher decides how many people from each subgroup
Convenience sample
Collect data from people or other relevant elements to which s/he has most convenient access
Exploratory research
True or false: 2/3 of U.S. samples published in JPSP were American undergrads in psychology courses
True
Trash in, ____ out
trash
What is the most widely used data collection technique?
Survey
Correlational research
Any non-experimental study in which correlations in data are examined and cause-effect relations are shown
How to conduct a survey:
1.) Develop hypothesis and decide survey type
2.) Write questions
3.) Plan how to record data
4.) Sampling
5.) Locate respondents, conduct interviews, record data
6.) Research report
Things that good survey questions do
avoid confusion
keep respondents perspective in mind
Watch out for leading questions
Avoid jargon, slang, abbreviations, vagueness, emotional lang, issues beyond capabilities, double negatives
Double-barreled question
A confusing survey question that includes 2+ ideas