How it Works
Pricing
Our Services
FAQ
My Account
Hire/Pay a math expert to do your math assignments, homework or online class
Get a FREE no-obligations price quote!
Get Started!
Hire/Pay a math expert to do your math assignments, homework, or online class
Get Started!
MyMathgenius.com
https://www.mymathgenius.com/images/Mymathgeniusbiglogo.png
01/01/2018
Confidence Interval Examples
This is a collection of a handful of statistics problems that ask for Confidence intervals. Specifically, this is broken up 3 ways: Confidence interval for mean (sigma known), Confidence interval for mean (sigma unknown), and proportion.
There are many many questions in the document attached. For example
Example 1:
The average life of light bulbs produced by SABA Electric Co. is believed to be normally distributed with the mean service life of 950 hours and a standard deviation of 100 hours. A random sample of 100 bulbs is tested and it has a mean life of 930 hours. Calculate the 99% confidence interval for mean lightbulb life
Example 2:
Safe Lumber Company hires an independent contractor to monitor the groundwater within a one mile radius of its factory to ensure that no toxic levels of arsenic are being released. The contractor takes a sample of groundwater from selected sites within the one mile radius. Suppose that data from 25 sites had arsenic levels averaging 75 ppb with a sample standard deviation of 30 ppb. Construct a 95% confidence interval for the arsenic level.
Example 3:
Borrowers Bank classifies credit cardholders as “prime” whenever they pay interest charges for at least 6 of the last 12 billing cycles. The table below cross classifies 2080 cardholders according to whether they are 1) prime or not, and 2) below age 30 or not
About the Solutions
Solutions to prior projects are given all dealing with confidence intervals. The first problem is provided with full solution.
Question Files
Confidence Interval Problems.doc
Other Details about the Project/Assignment
Subjects
:
Statistics
Topic
:
Homework problems for Confidence Intervals (Statistics)
Level
:
College / University
Tags
:
statistics, analysis, confidence interval, alpha
Price
:
$7.95
Purchase and Download Solutions
Math Genius
Kevin N.
Member Since:
Mar 2009
Customer Rating:
98.7%
Projects Completed:
968
Total Earnings:
Private
+1 Ratings from clients:
693
Project Details
Question Files
Confidence Interval Problems.doc
Subjects
:
Statistics
Topic
:
Homework problems for Confidence Intervals (Statistics)
Level
:
College / University
Tags
:
statistics, analysis, confidence interval, alpha
Customer Reviews
Rated
0
Times
Rating
(
4.75
/ 5 Stars)
(Click here to read more reviews)
Reviews of the solutions left by other users
No customer has left a detailed review for these math solutions. Be the first one to purchase them and leave a review for others!
Not exactly what you are looking for?
We regularly update our math homework solutions library and are continually in the process of adding more samples and complete homework solution sets. If you do not find what you are looking for, just go ahead and place an order for a custom created homework solution. You can
hire/pay a math genius to do your homework for you exactly to your specifications
.
Get Started
Pricing
FAQ
Solutions Library
Our Services
Privacy Policy
Terms of Service
Customer Support
1-855-4-MY-MATH
(1-855-469-6284)
Copyright 2005, MyMathGenius.com