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3301PracticeTest3

# 3301PracticeTest3 - IE 3301 Practice Quiz 3 Spring 2008...

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IE 3301 Practice Quiz 3 Spring 2008 NAME: ___________________________ GRADE ___________ ____ DO ALL WORK FOR CREDIT IN PENCIL IN THE SPACE PROVIDED. 1. The wall thickness of 36 glass two-liter bottles was measured by a quality-control engineer. The sample mean was 4.05 mm and the sample standard deviation was 0.12 mm. The distribution of wall thickness is unknown. (a) Find a 90% confidence interval on the true mean wall thickness. (b) Test a one-sided hypothesis to ensure that the true mean thickness exceeds 4.15 mm as required by the FDA by finding the associated P-value and drawing a conclusion from it.

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2. Of 1000 randomly selected cases of lung cancer, 823 resulted in death. (a) Construct a 95% confidence interval on the death rate from lung cancer. (b) For the null hypothesis that p = 0.8, find the P-value and state your conclusion on for this two-sided hypothesis.
3. Two types of plastic are suitable for use by an electronics component manufacturer. The relative breaking strengths of these plastics, which are both normally distributed, are important. It is known that σ 1 = σ 2 = 1.0 psi. From a random sample of size n

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3301PracticeTest3 - IE 3301 Practice Quiz 3 Spring 2008...

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