solve b and c LU | g in udy city ) of UUUUUISUIT S IIHS APPTOXIImately a normal

Question

solve b and c

LU | g in udy city ) of UUUUUISUIT S IIHS APPTOXIImately a normal distribution u o, o o/V2n. Use this fact with , to develop a large -sample twosided confidence interval formula for o. Then calculate a 95% con fidence interval the for true standard deviation of the fracture strength distribution based on the data given in Exercise 16 (the cited paper gave compel ling evidence in support of assuming normality). ler ed cts 18. Determine the confidence level for each of the fol- lowing large-sample one-sided confidence bounds : a. Upper bound:X + .84s/n b. Lower bound: X – 2.05s/n C. Upper bound: + .67s/Vn X 19. The charge-to-tap time (min) for a carbon steel in one type of open hearth furnace was determined for each heat in a sample of size 36, resulting in a

Explanation / Answer

18)

a) z score here is 0.84

This will have when alpha = 0.2, so, confidence level = 80%

b)

z score here is 2.05

This will have when alpha = 0.02, so, confidence level = 98%

c)

z score here is 0.67

This will have when alpha = 0.25, so, confidence level = 75%

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