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Theory of Statistics - George Mason University

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556 7 Statistical Hypotheses and Confidence Sets<br />

number N <strong>of</strong> random Bernoulli variates is noted. Based on the observed<br />

value <strong>of</strong> N we wish to test the hypotheses<br />

H0 : π ≥ 0.5 versus H1 : π < 0.5.<br />

using a test <strong>of</strong> size 0.05. A test with that exact size will require a random<br />

component.<br />

a) Define such a test (based on the negative binomial distribution), and<br />

sketch its power curve.<br />

b) Define a test for the same hypotheses and with the same size based on<br />

t being a realization <strong>of</strong> a binomial random variable with parameters<br />

N and π.<br />

c) Now, suppose we repeat the experiment as described and we obtain<br />

observations N1, . . ., Nm. What is the mean size <strong>of</strong> m tests based on<br />

the binomial distributions as in Exercise 7.5b?<br />

<strong>Theory</strong> <strong>of</strong> <strong>Statistics</strong> c○2000–2013 James E. Gentle

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