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class03-2-handouts

class03-2-handouts - PSTAT 120B Probability Statistics...

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PSTAT 120B - Probability & Statistics Class # 03-2- Estimator properties Jarad Niemi University of California, Santa Barbara 14 April 2010 Jarad Niemi (UCSB) Estimator properties 14 April 2010 1 / 20
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Class overview Announcements Announcements Homework Homework 1&2 answer keys are available Homework 3 due on Monday by 4pm in South Hall 5521 9.74a: only do part ’a’ If you don’t turn in homework, the best possible grade you can get is a B. Two most common mistakes on hw2 Not fully answer the question: what distribution? Need both family, e.g. normal, and parameters, e.g. mean and variance. Misreading Z values from table. Table contains P ( Z > c ) = P ( Z c ). In the news... Jarad Niemi (UCSB) Estimator properties 14 April 2010 2 / 20
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Class overview Wall street journal Later in the article: Those with strong statistics backgrounds will earn up to 20% more than generalist engineers. Jarad Niemi (UCSB) Estimator properties 14 April 2010 3 / 20
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Class overview Wall street journal Online advertisements Online advertisement provide Revenue for hosting sites Traffic for advertisers Pay-per-click ($0.10) Few web-surfers click on ads (0.04%) slashdot.org generates 40 million page views per month On average, per month, slashdot makes 40 , 000 , 000 · 0 . 04% · $0 . 10 = $1 , 600 Jarad Niemi (UCSB) Estimator properties 14 April 2010 4 / 20
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Class overview Wall street journal vs. Jarad Niemi (UCSB) Estimator properties 14 April 2010 5 / 20
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Class overview Wall street journal Google supplies advertisements to 150,000 sites Google’s cut is somewhere around 20% Suppose you determine that one ad has click-through-rate of 0.041% compared to the average of 0.040%.
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