Question

Determine the confidence level for each of the following large-sample one-sided confidence bounds. (Round your answers to the nearest whole number.) (a) Upper bound: x + 1.28s/n (b) Lower bound: - 1.888/Vn (c) Upper bound: x + 0.845/vn You may need to use the appropriate table in the Appendix of Tables to answer this question. Need Help? Read It Watch It Talk to a Tutor -110 points V DEVORESTAT9 7.E.503.XP. My Notes Ask Your Teacher V An article gave the following summary data on shear strength (kip) for a sample of 3/8-in. anchor bolts: n = 65, X = 4.25, s = 1.90. Calculate a lower confidence bound using a confidence level of 90% for true average shear strength. (Round your answer to two decimal places.) | kip You may need to use the appropriate table in the Appendix of Tables to answer this question. Need Help? Read It Talk to a Tutor

Answer 1

a)

from excel:

confidence level==ROUND((NORMSDIST(1.28)*100,0) =90.0%

b)confidence level=97%

c)confidence level=80 %

2)

lower bound =4.25-1.28*1.9/sqrt(45)=3.89