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Collecting Data for Statistics Screenshot 2026-09-21 at 3.44.00 PM -…
Collecting Data for Statistics
Sampling Methods
good sampling methods :
SRS (simple random sample)
cluster sampling
stratified sampling
poor sampling methods
convenience sampling
voluntary response
Types of Statistical Studies
Experiments
needs a control group vs treatment group
control for confounding variables
hypothesis to test
Observational studies
already occurring
not being manipulated by experimenter
Interpreting Results
bias in results
under coverage
response bias
non-response
correlation vs causation
causation
tells you cause
experiment is necessary for causation
correlation
shows relationship
does not establish causation
