Conditional probability and independence
Distinguish the chance of an event from its chance after learning that another event occurred.
Reference · Guide · Foundation
Understand the sampling design, units and distribution assumptions.
Distinguish the chance of an event from its chance after learning that another event occurred.
Reference · Guide · Foundation
Combine measurements using weights that match the question and keep ratio denominators explicit.
Reference · Guide · Foundation
Quantify sampling uncertainty when a distributional model and sampling design justify it.
Reference · Guide · Advanced
Describe a numeric sample before choosing more advanced analysis.
Tool · Calculator + guide · Applied
Describe a linear relationship between paired observations.
Tool · Calculator + guide · Advanced
Plan the number of completed responses for a simple random sample.
Tool · Calculator + guide · Applied