Question
3) Consider a random sample of size 20 from a normal distribution, Xi ~ N(mu, s^2), and suppose that x(bar) = 11 and s^2 =
3) Consider a random sample of size 20 from a normal distribution, Xi ~ N(mu, s^2), and suppose that x(bar) = 11 and s^2 = 16.
a) Assuming it is known that s^2 = 4, test Ho: mu > or equal to 12 versus Ha: mu < 12 at the significance level alpha = .01.
b) What is B = P[TII] if in fact mu = 10.5?
c) What sample size is needed for the power of the test to be .9 for the alternative value mu = 10.5?
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An Introduction to Analysis
Authors: William R. Wade
4th edition
132296381, 978-0132296380
