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Lecture 9

# ECON 2209 Lecture 9: 10February_EconStats_Karagodsky Premium

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School
Boston College
Department
Economics
Course
ECON 2209
Professor
Karagodsky
Semester
Fall

Description
EconStatistics February 10 2017 1 Binomial mean and variance Mean = E[x] = nP Variance = var(x) = nP(1P) 1.1 Probability of 4 heads from 4 coin tosses heads Pr(H = h) 0 6.25 1 25.0 2 37.5 3 25.0 4 6.25 Pr(x = 0 n = 4, p = .5) Note: here the line doesnt mean conditional What is the chance that you throw the coin 4 times and get 4 heads? P(n = 4) = 4! :5 (1 :5) = 1 :5 1 = 6:25 4!(44)! 2 Shapes of Binomial Distribution 1
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