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• ## Related Books

 2 answersLast reply by: joshua painterTue Feb 23, 2016 7:07 PMPost by Zachary Goyetche on December 10, 2013Math is wrong on 'Extra Example #1'. The correct answer is: CI_99%=(265154, 274286)The number of errors I've come across on this site is horrendous. 3 answersLast reply by: joshua painterTue Feb 23, 2016 7:00 PMPost by Patricia Hicks on January 17, 2011Question: Working on standard deviation example. After I subtract z 1-.05/2 and get z=.975 how did you get the answer 1.96? 1 answerLast reply by: Silvia ManentSun Oct 3, 2010 8:47 AMPost by Abey Philip on May 25, 2010the margin of error on example 2 seems to be wrong...Instead of 1.225 it should 1.372 right??

### Estimation of a Population Mean: Standard Deviation Known

• If the population is normal and n< 30, the confidence interval for the mean is

.

• If the population is n> 30 and is from any distribution, the confidence interval for the mean is

.

### Estimation of a Population Mean: Standard Deviation Known

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

• Intro 0:00
• Population is Normal, n<30 0:10
• Confidence Interval
• Example 1 2:34
• Example 2 5:54
• When n>30, Any Distribution 7:58
• Confidence Interval
• Example 3 9:14
• Example 4 11:16
• Extra Example 1
• Extra Example 2