Lecture_10_10

Lecture_10_10 - Lecture of October 10 Midterm is coming up...

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1 Lecture of October 10 Lecture of October 10 • Midterm is coming up (Oct 20). I will talk about midterm on Thursday. • This Friday (Oct 13) No lab but I will do one lecture. • HW#6 assigned and is due 10/17 in class -- No late homework accepted for this assignment .
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2 Example 3.3 Example 3.3 The cooling system in a nuclear submarine consists of an assembly pipe through which a coolant is circulated. Specifications require that weld strength must exceed 150 psi. Suppose the designers decide to test the hypothesis H 0 : µ = 150. Which of the following alternative hypothesis are preferable: H 1 : µ > 150; or H 1 : µ < 150?
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3 Two Types of Errors Two Types of Errors Happening in Hypothesis Test Happening in Hypothesis Test • Type I error ( producer’s risk, α error): (we have used this α when performing a hypothesis test) α = Pr {type I error} = Pr {reject H 0 | H 0 is true} =Pr{product is rejected | but product is good} =Pr{defendant is convicted | but defendant is innocent} • Type II error (consumer’s risk, β error): β = Pr{type II error} = Pr{fail to reject H 0 | H 0 is false}
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Lecture_10_10 - Lecture of October 10 Midterm is coming up...

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