A research engineer for a tire manufacturer is

Chapter 8, Problem 29E

(choose chapter or problem)

Get Unlimited Answers
QUESTION:

Problem 29E

A research engineer for a tire manufacturer is investigating tire life for a new rubber compound and has built 16 tires and tested them to end-of-life in a road test. The sample mean and standard deviation are 60,139.7 and 3645.94 kilometers. Find a 95% confidence interval on mean tire life.

Questions & Answers

QUESTION:

Problem 29E

A research engineer for a tire manufacturer is investigating tire life for a new rubber compound and has built 16 tires and tested them to end-of-life in a road test. The sample mean and standard deviation are 60,139.7 and 3645.94 kilometers. Find a 95% confidence interval on mean tire life.

ANSWER:

Step 1 of 2

Given,

Sample size, n = 16.

The sample mean,

The standard deviation,

For  and s, the mean and standard deviation of a random sample from a normal distribution with unknown variance , a  Confidence Interval on  is given by,

where  is the upper  percentage point of the t distribution with n – 1 degrees of freedom

Add to cart


Study Tools You Might Need

Not The Solution You Need? Search for Your Answer Here:

×

Login

Login or Sign up for access to all of our study tools and educational content!

Forgot password?
Register Now

×

Register

Sign up for access to all content on our site!

Or login if you already have an account

×

Reset password

If you have an active account we’ll send you an e-mail for password recovery

Or login if you have your password back