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Category > Statistics Posted 16 May 2017 My Price 6.00

To compare the corrosion-resistance properties of two types

To compare the corrosion-resistance properties of two types of material used in underground pipe lines, specimens of both types are buried in soil for a 2-year period and the maximum penetration (in mils) for each specimen is measured. A sample of size 42 specimens of material type A yielded 1 = 0.49 and S1 = 0.19, and a sample of size 42 specimens of material type B gave 2 = 0.36 and S2 = 0.16. Is there evidence that the average penetration for material A exceeds that of material B by more than 0.1?

(a) State the null and alternative hypotheses. Is the test statistic in (9.2.14) appropriate for this data? Justify your answer.

(b) State which statistic you will use, test at level α = 0.05, and compute the p-value. What assumptions, if any, are needed for the validity of this test procedure?

(c) Construct a 95% CI for the difference in the two means.

 

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Alpha Geek
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Status NEW Posted 16 May 2017 10:05 AM My Price 6.00

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file 1494929066-Answer.docx preview (193 words )
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