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#1 2010-03-12 02:58:26

allan89a
Member
Registered: 2010-03-12
Posts: 1

Statistics, type II error

"The diameter of a wire should be 8 cm. It follows a normal distribution and has a standard deviation of 0.01 cm.
A person tests each delivery by taking 5 samples, accepting the goods only if the mean is at most 8.01"

a)
Find the probability of type 1 error?

b)
A hypothesis test is to be carried out with P(type I error) = P(type II error) and either one being at 0.1%.
What is the necessary sample size for this test? (answer in my book says it's n=>17)

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