NEED B TIA On the basis of extensive tests, the yield pa nt of a particular type
ID: 3368658 • Letter: N
Question
NEED B TIA
On the basis of extensive tests, the yield pa nt of a particular type of mild steel reinforcing bar is known to be na maly distributed with ? normality or the value of a. 100. The composition of the bar has been slightly modified, but the modificat on is not believed to have affected either the a) Assuming this to be the case?a sample o 25 modified bars resulted in a sample average yield point of 8419 b, compute a 90% CI or the true average yield point of the modified bar Round your answers to one decimal place. 9830 184519b 1.9 b) How would you modify the interval in part (a) to obtain a confidence level of 989% (Round your answer to two decimal places.) The value of zshould be changed to 32 You may need to use the appropriate table in the Appendix of Tables to answer this question. Need Help?Explanation / Answer
Sol b:
The confidence level of 98% is calculated as follows:
Consider, the confidence level is 0.98
For (1- ?) = 0.98
? = 0.02
?/2 = 0.01
From the Standard Normal Table, the required Z value for 98% confidence level is 2.33
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