107 725
Assignments Done
96.6%
Successfully Done
In April 2024
In April 2024
Your physics assignments can be a real challenge, and the due date can be really close — feel free to use our assistance and get the desired result.
Physics
Be sure that math assignments completed by our experts will be error-free and done according to your instructions specified in the submitted order form.
Math
Our experts will gladly share their knowledge and help you with programming projects. Keep up with the world’s newest programming trends.
Programming
Answer to Question #42056 in Statistics and Probability for surya
Question #42056
A civil engineer is analyzing the compressive strength of concrete. A random sample of 12 specimens has a mean compression strength of 3250 psi with variance 1000 (psi)2.
i) Construct a 95% confidence interval for the population mean compressive strength.
ii) Construct a 95% confidence interval for the population standard deviation of compressive strength.
i) Construct a 95% confidence interval for the population mean compressive strength.
ii) Construct a 95% confidence interval for the population standard deviation of compressive strength.
Expert's answer
Learn more about our help with Assignments: Statistics and Probability
"assignmentexpert.com" is professional group of people in Math subjects! They did assignments in very high level of mathematical modelling in the best quality. Thanks a lot
#339914 on Dec 2023
#339914 on Dec 2023
Comments
Dear SSaa. We use Student's t-distribution instead of z-scores in this problem, because population standard deviation is not known in this problem and the sample size is small (n=12).
u should get the standard deviation that is the squre root of the variance and then proceed same process (1-(CI/100))=0.05 look for probability of 0.05/2=0.025 Z=1.96 ur ans will be mean (+,-) ((z*standard deviation) /sqrt(n) ) 3267.89 3232.107
Leave a comment