2103 Chap 5 OCTOBER 20, 22, 25, 27, 29 FALL 2010 Class Notes

2103 Chap 5 OCTOBER 20, 22, 25, 27, 29 FALL 2010 Class Notes

Info icon This preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 5: Confidence Intervals and Sample Size Sec 5.1 Introduction Point Estimate Target Parameter Point Estimator Interval Estimator Confidence Interval Monday October 25: Chapter Five; Confidence Intervals and Reminder: Your Peer Teacher, Marc Fulmer has hours Monda Extra Credit: As shown on syllabus, students can earn up to for attending office hour e.g., if students attend o If a student attends 8 se Contact: Rob Pred at [email protected], and marc.fulm Pred is available before Sec. 5.2 Confidence Interval for Population Mean : using Nor Confidence Coefficient Degree of Confidence (aka, level of confidence) Formula for Single Sample Confidence Interval Interpretation of Results
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Margin of Error Let's say we are testing Laptop Batteries X= Length of Laptop use in hours on one complete charge n= 36 36 144batterie Sample MeanXbar= 4.68 4.68 4.68hours SDEV=Sigma= 0.37 0.37 0.37hours Confidence Coeff 0.900 0.95 0.9595% de Z alpha/2= 1.645 1.96 1.96 Std. Error=SD/Sqrt(n)= 0.06 0.06 0.03 Margin of Error= 0.10 0.12 0.06 Confidence Limits: Upper(UCL)= 4.78 4.80 Lower(LCL)= 4.58 4.56 Interval Width UCL-LCL= 0.242 MOE*2= Interpretation: with 95% degree of confidence, we conclude the True Population mean life falls between 4.56 and 4.80 hrs Effects of Sample Size: As "n" increases, margin of error dec and Limits would move Effects of Confidence Coefficient on Margin of Error?
Image of page 2
Point Estimate=Xbar 6563 X=expenses pe Sample Size= 1751 Upper Limit= Std. Deviation= 2484 Lower Limit= Std. Error of Mean= 59.36 Critical Value of Z= 1.65
Image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern