Stats20Descriptive

Stats20Descriptive - Untitled Document 9:39 PM Lesson 2.3...

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

View Full Document Right Arrow Icon
6/27/09 9:39 PM Untitled Document Page 1 of 2 file:///Users/bonk/Desktop/dukeonly/Stats20Descriptive.html Lesson 2.3 Mean, Median and Mode (1) Mean The mean is the same as the average. To find the mean, add all the values and divide by the total number of values. Example: {2, 3, 5, 6} The mean The letter x with a bar over it, , represents the sample mean. The Greek letter, µ , represents the population mean. Median The median is the middle value of a set of numbers that has been ordered from smallest to largest. The upper case letter M is used for the median. Example: A sample of statistics exam scores for 14 students are (in order from smallest to largest) as follows: 53, 59, 63, 63, 72, 72, 76, 78, 81, 83, 84, 84, 90, 93 Notice that 14 is an even number. The median is between 7th and 8th values (the middle two values). The 7th value is 76 and the 8th value is 78. The median M = Example: A second sample of statistics exam scores for 15 students are (in order from smallest to largest) as follows: 52, 60, 65, 67, 70, 71, 74, 76, 78, 78, 78, 80, 86, 89, 95 Notice that 15 is an odd number.
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