P ROBABILITY & S TATISTICS Course Review. P OPULATIONS AND S AMPLES Each week, the Gallup Poll questions a sample of about 1500 adult U.S. residents to.

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Presentation transcript:

P ROBABILITY & S TATISTICS Course Review

P OPULATIONS AND S AMPLES Each week, the Gallup Poll questions a sample of about 1500 adult U.S. residents to determine national opinion on a wide variety of issues.

S AMPLING B IAS

N ON -S AMPLING B IAS

U NBIASED S AMPLING T ECHNIQUES RachelNadineSadeShavonte JulianKeithBrooksArana CandaceTreyJordanKelly ImaniAharonLucasStelios TravisAnthonyTariqWill XavierChelseaBennie

T YPES OF S TUDIES Survey Observational Study Experiment