Question

In: Math

How would you modify the interval in part (a) to obtain a confidence level of 92%

On the basis of extensive tests, the yield point of a particular type of mild steel-reinforcing bar is known to be normally d

On the basis of extensive tests, the yield point of a particular type of mild steel-reinforcing bar is known to be normally distributed with σ = 100. The composition of the bar has been slightly modified, but the modification is not believed to have affected either the normality or the value of σ.


(a) Assuming this to be the case, if a sample of 25 modified bars resulted in a sample average yield point of 8474 lb, compute a 90% CI for the true average yield point of the modified bar.

(b) How would you modify the interval in part (a) to obtain a confidence level of 92%? 

Solutions

Expert Solution

milcah answered 2 years ago
Next > < Previous

Related Solutions

1) You want to construct a 92% confidence interval. The correct z* to use is A)...
1) You want to construct a 92% confidence interval. The correct z* to use is A) 1.645 B) 1.41 C) 1.75 2) Suppose the average Math SAT score for all students taking the exam this year is 480 with standard deviation 100. Assume the distribution of scores is normal. The senator of a particular state notices that the mean score for students in his state who took the Math SAT is 500. His state recently adopted a new mathematics curriculum,...
Determine the z critical value for a 92% confidence level. Show work or explain how you...
Determine the z critical value for a 92% confidence level. Show work or explain how you found your answer 2. Determine the t critical value for a 95% confidence level when n =15. Show work or explain how you found your answer. 3. Ten bagels were selected at Brueggers. If the sample mean weight was 1.4 oz. with a population standard deviation of 0.4 oz., construct a 90% confidence interval for the population mean. Interpret your answer. 4.To estimate the...
If you were given a choice: Wide confidence interval with a small confidence level Wide confidence...
If you were given a choice: Wide confidence interval with a small confidence level Wide confidence interval with a large confidence level Narrow confidence interval with a small confidence level Narrow confidence interval with a large confidence level Which would you choose? Why? Provide at least one hypothetical example.
The value of zα/2 when determine the 92% confidence interval for p
The value of zα/2 when determine the 92% confidence interval for p
What is a rejection region? What is a confidence level? What is a confidence interval?Discuss how...
What is a rejection region? What is a confidence level? What is a confidence interval?Discuss how the three concepts are related to each other. Provide an example in discussion. (9pts)
Describe the steps involved in using the z-interval procedure to obtain a confidence interval for the...
Describe the steps involved in using the z-interval procedure to obtain a confidence interval for the population mean when standard deviation is known. Include a description of the preliminary data analysis. Why is preliminary data analysis needed?
Find the confidence interval for the given values of ?, ?, ?⎯⎯⎯, and confidence level. ?=2.1,...
Find the confidence interval for the given values of ?, ?, ?⎯⎯⎯, and confidence level. ?=2.1, ?=30, ?⎯⎯⎯=4.5, confidence = 0.92 Enter your answer by filling in the blanks ( ____ , ____ ). Round final answers to 2 decimal places.
Find the confidence interval for the given values of ?, ?, ?⎯⎯⎯, and confidence level. ?=21,...
Find the confidence interval for the given values of ?, ?, ?⎯⎯⎯, and confidence level. ?=21, ?=42, ?⎯⎯⎯=53, confidence = 0.89 Enter your answer by filling in the blanks ( ____ , ____ ). Round final answers to 2 decimal places.
At a confidence level of 95% a confidence interval for a population proportion is determined to...
At a confidence level of 95% a confidence interval for a population proportion is determined to be 0.65 to 0.75. If the sample size had been larger and the estimate of the population proportion the same, this 95% confidence interval estimate as compared to the first interval estimate would be A. the same B. narrower C. wider
At a confidence level of 95% a confidence interval for a population proportion is determined to...
At a confidence level of 95% a confidence interval for a population proportion is determined to be 0.65 to 0.75. If the sample size had been larger and the estimate of the population proportion the same, this 95% confidence interval estimate as compared to the first interval estimate would be
ADVERTISEMENT
Subjects
ADVERTISEMENT
Latest Questions
ADVERTISEMENT