Friday
April 25, 2014

Homework Help: statistics

Posted by Yesenia on Tuesday, March 1, 2011 at 7:59pm.

How heavy a load (pounds) is needed to pull apart pieces of Douglas fir 4 inches long and 1.5 inches square? Here are data from students doing a laboratory exercise:
22565 28373 25826 26468 27508
23401 24998 32436 25405 29235
29679 33661 27775 28517 30371
27793 32527 32748 26052 29398

We are willing to regard the wood pieces prepared for the lab session as an SRS of all similar pieces of Douglas fir. Suppose that the strength of pieces of wood like these follows a Normal distribution with standard deviation 3100 pounds.

Give a 95% confidence interval for the mean load required to pull the wood apart (give your answer with three decimal places).



95% confidence interval for the mean load is__________ to__________ .

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

MATH - Li-Hua wants to create a triangular fame. She has two pieces of wood, ...
College Algebra - The load L a horizontal beam can safely support varies jointly...
mnhs - an open box is to be made from a rectangular piece of tin 12 inches long ...
Math - How many square inches of wrapping paper are needed to entirely cover a ...
Math - The strength S of a rectangular beam varies jointly as its width w and ...
MATH - Oscar is giving his mother a new acquarium in the shape of a rectuangular...
Math - You are using glass tiles to make a picture frame for a square photograph...
One Trigonometry Question Please Help! - Quilt squares are cut on the diagonal ...
Math - 1) what is the length of the diagonal of a square whose sides are 3 ...
calculus - A large soup can is to be designed so that the can will hold 54pi ...

Search
Members