March 26 - o The standard deviation is the square root of...

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

View Full Document Right Arrow Icon
March 26, 2008 Dispersion: variance o A more exact statistic would tell us something about each case, not just the difference between 2 cases o We could ass up the distance between each point and the mean, but that would be zero: sigma(x sub I – x (with bar over)) = 0; Σ(x i -)=0 o Instead, we square the distances from each point to the mean and take the average squared distance – this is the variance Calculating the variance o For a population: (note) o For a sample: (note) Standard deviation
Image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: o The standard deviation is the square root of the variance. It is the typical distance of each score from its mean (equation in note form) o (Example) Dispersion: box-plots o A box-plot shows us the median, the inter-quartile range, and outliers o The “whiskers” extend from 1.5 times the IQR below the median, to 1.5 times the IQR above the median o The outliers are marked past that Exam Multiple choice, true/false, a few problems to work out Non-cumulative...
View Full 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