Quiz4 - Quiz 4 Let Xi i=1 2 n be a random sample from a...

Info icon This preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Quiz 4 , = , , …, , Let Xi i 1 2 n be a random sample from a population with mean . μ1 and variance σ12 , = , , …, , Let Yi i 1 2 n be a random sample from a population with mean . μ2 and variance σ22 1. Suppose these two samples are independent, please derive the expression for - ; varX Y 2. Suppose these two samples are paired in that ( , )≡ corr Xi Yi ρ , please derive the expression for - . varX Y Solution: 1. - = + = + varX Y varX varY σ12n σ22n
Image of page 1
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