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Unit: Inference comparing two groups or populations

AP Stats:
DAT (BI)
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DAT‑3 (EU)
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UNC (BI)
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UNC‑4 (EU)
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VAR (BI)
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VAR‑6 (EU)
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VAR‑7 (EU)

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AP Stats:
DAT (BI)
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DAT‑3 (EU)
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DAT‑3.C (LO)
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DAT‑3.C.1 (EK)
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DAT‑3.D (LO)
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DAT‑3.D.1 (EK)
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UNC (BI)
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UNC‑4 (EU)
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UNC‑4.N (LO)
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UNC‑4.N.1 (EK)
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VAR (BI)
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VAR‑6 (EU)
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VAR‑6.H (LO)
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VAR‑6.H.1 (EK)
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VAR‑6.H.2 (EK)
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VAR‑6.H.3 (EK)
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VAR‑6.I (LO)
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VAR‑6.I.1 (EK)
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VAR‑6.J (LO)
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VAR‑6.J.1 (EK)
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VAR‑6.K (LO)
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VAR‑6.K.1 (EK)
Level up on the above skills and collect up to 600 Mastery points
AP Stats:
UNC (BI)
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UNC‑4 (EU)
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UNC‑4.V (LO)
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UNC‑4.V.1 (EK)
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UNC‑4.V.2 (EK)
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UNC‑4.W (LO)
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UNC‑4.X.2 (EK)
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UNC‑4.Y (LO)
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UNC‑4.Y.1 (EK)
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UNC‑4.Y.2 (EK)
AP Stats:
DAT (BI)
,
DAT‑3 (EU)
,
DAT‑3.H (LO)
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DAT‑3.H.1 (EK)
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DAT‑3.H.2 (EK)
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UNC (BI)
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UNC‑4 (EU)
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UNC‑4.AA (LO)
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UNC‑4.AA.1 (LO)
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VAR (BI)
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VAR‑7 (EU)
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VAR‑7.B (LO)
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VAR‑7.B.2 (EK)
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VAR‑7.C (LO)
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VAR‑7.C.2 (EK)
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VAR‑7.F (LO)
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VAR‑7.F.1 (EK)
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VAR‑7.G (LO)
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VAR‑7.G.1 (EK)
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VAR‑7.I (LO)
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VAR‑7.I.1 (EK)
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About this unit

If a poll from one location shows 55% of voters support a measure, but a poll from another location shows 45% support, does that mean there is a difference between the two populations? We can make a confidence interval to estimate the difference, or do a significance test to see if the difference is significant. We'll use similar methods to compare the means of two groups.
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