1. Dismiss Notice
  2. Guest, be sure to check out How To Get Into Dental School, our free downloadable PDF with step-by-step details for dental school applicants!
    Dismiss Notice
  3. Dismiss Notice
  4. Download free Tapatalk for iPhone or Tapatalk for Android for your phone and follow the SDN forums with push notifications.
    Dismiss Notice

variance and standard deviation

Discussion in 'DAT Discussions' started by issa, Aug 9, 2006.

  1. issa

    issa Senior Member
    5+ Year Member

    Joined:
    Aug 24, 2005
    Messages:
    561
    Likes Received:
    0
    what are the formulas for variance and standard deviation? i found the formulas but they were confusing.

    the question: 7 employees with a rating of 5,4,3,3,3,2,1
    what is the standard deviation?

    i remember that we have to find the avergae and then i don't remember the formula and to do next to solve this problem.
     
  2. Note: SDN Members do not see this ad.

  3. tinman831

    tinman831 ¯\_(ツ)_/¯
    Administrator Dentist Lifetime Donor Classifieds Approved 10+ Year Member

    Joined:
    Dec 11, 2004
    Messages:
    11,346
    Likes Received:
    72
    Status:
    Dentist
    Here's a link that explains it pretty well:

    http://www.gcseguide.co.uk/standard_deviation.htm

    1) find the average of the numbers.
    2) subtract the mean from each number individually and square the result
    3) add up all those squared results
    4) divide the sum from step 3 by (n-1)
    5) square root the result to get your standard deviation
     
  4. DMD to Be

    DMD to Be not luffin' this weather.
    5+ Year Member

    Joined:
    Mar 22, 2006
    Messages:
    387
    Likes Received:
    0
    Status:
    Pre-Dental
    Hmm, and this is on the DAT? I haven't see it anywhere in review books...
     

Share This Page