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Lecture Comments (10)

2 answers

Last reply by: joshua painter
Tue Feb 23, 2016 7:07 PM

Post by Zachary Goyetche on December 10, 2013

Math 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 answers

Last reply by: joshua painter
Tue Feb 23, 2016 7:00 PM

Post by Patricia Hicks on January 17, 2011

Question: 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 answer

Last reply by: Silvia Manent
Sun Oct 3, 2010 8:47 AM

Post by Abey Philip on May 25, 2010

the 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