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# Inference comparing two groups or populations

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

AP Stats: UNC (BI), UNC‑4 (EU), UNC‑4.I (LO), UNC‑4.I.1 (EK), UNC‑4.J (LO), UNC‑4.J.1 (EK), UNC‑4.K (LO), UNC‑4.K.1 (EK)

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Conditions for inference on two proportionsGet 3 of 4 questions to level up!

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Two-sample z interval for the difference of proportionsGet 3 of 4 questions to level up!

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AP Stats: DAT (BI), DAT‑3 (EU), DAT‑3.C (LO), DAT‑3.C.1 (EK), DAT‑3.D (LO), DAT‑3.D.1 (EK), DAT‑3.D.2 (EK), UNC (BI), UNC‑4 (EU), UNC‑4.N (LO), UNC‑4.N.1 (EK), VAR (BI), VAR‑6 (EU), VAR‑6.H (LO), VAR‑6.H.1 (EK), VAR‑6.H.2 (EK), VAR‑6.H.3 (EK), VAR‑6.I (LO), VAR‑6.I.1 (EK), VAR‑6.J (LO), VAR‑6.J.1 (EK), VAR‑6.K (LO), VAR‑6.K.1 (EK)

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Writing hypotheses for testing the difference of proportionsGet 3 of 4 questions to level up!

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Test statistic in a two-sample z test for the difference of proportionsGet 3 of 4 questions to level up!

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P-value in a two-sample z test for the difference of proportionsGet 3 of 4 questions to level up!

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Making conclusions about the difference of proportionsGet 3 of 4 questions to level up!

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Level up on the above skills and collect up to 600 Mastery points

AP Stats: UNC (BI), UNC‑4 (EU), UNC‑4.V (LO), UNC‑4.V.1 (EK), UNC‑4.V.2 (EK), UNC‑4.W (LO), UNC‑4.W.1 (EK), UNC‑4.X (LO), UNC‑4.X.1 (EK), UNC‑4.X.2 (EK), UNC‑4.Y (LO), UNC‑4.Y.1 (EK), UNC‑4.Y.2 (EK)

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Conditions for inference on two meansGet 3 of 4 questions to level up!

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Two-sample t interval for the difference of meansGet 3 of 4 questions to level up!

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AP Stats: DAT (BI), DAT‑3 (EU), DAT‑3.H (LO), DAT‑3.H.1 (EK), DAT‑3.H.2 (EK), UNC (BI), UNC‑4 (EU), UNC‑4.AA (LO), UNC‑4.AA.1 (LO)

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Practice

Writing hypotheses to test the difference of meansGet 3 of 4 questions to level up!

0/100 points

Test statistic in a two-sample t testGet 3 of 4 questions to level up!

0/100 points

P-value in a two-sample t testGet 3 of 4 questions to level up!

0/100 points

Making conclusions about the difference of meansGet 3 of 4 questions to level up!

0/100 points

Level up on the above skills and collect up to 600 Mastery points

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Level up on all the skills in this unit and collect up to 1200 Mastery points!#### Unit test

### 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.AP® is a registered trademark of the College Board, which has not reviewed this resource.