Sampling2 - Announcements Sampling...

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1 Sampling 3.2.2011 Announcements Midterm Exam: W 3/16 or F 3/18? Home works Inference from Sample Know information about specific elements within the sample. May want to know information about population. So we use statistical inference: Sample statistic Confidence that statistic is representative of population parameter Deck of Cards What percentage of the deck is red? That is our population parameter P If we took a sample of cards we could come up with If we took a sample of cards, we could come up with an estimate of P ^ P Inference How close is our estimate to the real population parameter? Sampling error Diff bt ti t d Difference between estimate and p.p. Repeated Sampling By repeating sampling, we can decide how confident we are with our estimator.
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2 EXAMPLE OF PLAYING CARDS DRAW 1 6 red 4 black EXAMPLE OF PLAYING CARDS DRAW 1 6 red 4 black DRAW 2 5 red 5 black DRAW 3 4 red 6 black DRAW 4 2 red 8 black DRAW 5 5 red 5 black 5 Random Draws of 10 Cards 2 3 ency 0 1 zero one two three four five six seven eight
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Sampling2 - Announcements Sampling...

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