ST2 · Collection 2 / H: designs Sampling and collecting data mind map

Collection 2

• Reliability and validity: Consistent results need not measure the right thing.
• Sensitivity and bias: Sensitivity affects participation and honesty.
• Clean without inventing: Verify corrections; preserve genuine unusual data.
• Extraneous variables: Control other plausible influences.

H: designs

• Higher: Multiple strata: Combined categories define multiple strata.
• Higher: Random response: Known random mechanism protects sensitive answers.
• Higher: Controls and matched pairs: Baseline and matching reduce alternative explanations.

Connections

• Collection 2 → H: designs: Sensitive responses and extraneous influences motivate private response methods and controlled comparisons.