1. Tensile strength tests were carried out on two different grades of wire rod resulting in the following data: Grades 1 2 Sample Sample Size Mean 129 107.6 129 123.6 Sample Std.Dev. 1,30 2 a) Find the 95% confidence interval for the mean tensile strength difference between two grades. b) How will the interval change if the sample size for each grade is 20? (If necessary, state your assumption.)

MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
icon
Related questions
Question
1. Tensile strength tests were carried out on two different grades of wire rod resulting
in the following data:
Grades
1
2
Sample
Size
129
129
Sample
Mean
107.6
123.6
Sample
Std.Dev.
1,30
2
a) Find the 95% confidence interval for the mean tensile strength difference between
two grades.
b) How will the interval change if the sample size for each grade is 20? (If necessary,
state your assumption.)
Transcribed Image Text:1. Tensile strength tests were carried out on two different grades of wire rod resulting in the following data: Grades 1 2 Sample Size 129 129 Sample Mean 107.6 123.6 Sample Std.Dev. 1,30 2 a) Find the 95% confidence interval for the mean tensile strength difference between two grades. b) How will the interval change if the sample size for each grade is 20? (If necessary, state your assumption.)
Expert Solution
trending now

Trending now

This is a popular solution!

steps

Step by step

Solved in 3 steps with 2 images

Blurred answer
Similar questions
Recommended textbooks for you
MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
Statistics
ISBN:
9781119256830
Author:
Amos Gilat
Publisher:
John Wiley & Sons Inc
Probability and Statistics for Engineering and th…
Probability and Statistics for Engineering and th…
Statistics
ISBN:
9781305251809
Author:
Jay L. Devore
Publisher:
Cengage Learning
Statistics for The Behavioral Sciences (MindTap C…
Statistics for The Behavioral Sciences (MindTap C…
Statistics
ISBN:
9781305504912
Author:
Frederick J Gravetter, Larry B. Wallnau
Publisher:
Cengage Learning
Elementary Statistics: Picturing the World (7th E…
Elementary Statistics: Picturing the World (7th E…
Statistics
ISBN:
9780134683416
Author:
Ron Larson, Betsy Farber
Publisher:
PEARSON
The Basic Practice of Statistics
The Basic Practice of Statistics
Statistics
ISBN:
9781319042578
Author:
David S. Moore, William I. Notz, Michael A. Fligner
Publisher:
W. H. Freeman
Introduction to the Practice of Statistics
Introduction to the Practice of Statistics
Statistics
ISBN:
9781319013387
Author:
David S. Moore, George P. McCabe, Bruce A. Craig
Publisher:
W. H. Freeman