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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 on theme: "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."— Presentation transcript:

1 P ROBABILITY & S TATISTICS Course Review

2 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.

3 S AMPLING B IAS

4 N ON -S AMPLING B IAS

5 U NBIASED S AMPLING T ECHNIQUES 69051648178717409517 84534064898720197245 RachelNadineSadeShavonte JulianKeithBrooksArana CandaceTreyJordanKelly ImaniAharonLucasStelios TravisAnthonyTariqWill XavierChelseaBennie

6 T YPES OF S TUDIES Survey Observational Study Experiment

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