Handout_2_Summation_symbol_and_measures_of_central_tendency

Handout_2_Summation_symbol_and_measures_of_central_tendency...

Info icon This preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Feb 7’09 SUMMATION SYMBOL AND MEASURES OF CENTRAL TENDENCY #2 THE SUMMATION SYMBOL In statistics and in other math courses the Greek capital letter Σ (“sigma”) is used as a summation symbol which indicates the sum of related terms. For example, 5 Σ i = 1 + 2 + 3 + 4 + 5 = 15 i =1 means “the sum of the integers designated by i , from i = 1 to i = 5 . The letter i is called the index of summation; i is replaced by a series of consecutive numbers, starting with the lower limit of summation (its numerical value is placed below the summation symbol ) and ending with the upper limit of summation (its numerical value is placed above the summation symbol). In the discussed example, the lower limit is 1 , and the upper limit is 5 . ( Any letter may be used as a summation symbol.) If a variable quantity is denoted by x , then the successive values of that variable can be indicated by using a subscripted variable , as in x 1 , x 2 , x 3 , … (read as “x-sub- one ”, “x-sub- two ”, “x-sub- three ”, …) For example, if x 1 = 4, x 2 = 2, x 3 = 1,
Image of page 1

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

View Full Document Right Arrow Icon
Image of page 2
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