1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Grouped Data

  1. Jun 2, 2007 #1

    danago

    User Avatar
    Gold Member

    If im given a frequency table, but instead of set scores, i am given classes, or a range of scores. So for example:

    20-29 | 11
    30-39 | 12
    40-49 | 2

    etc.

    If asked to find the median of the set of data, should i give the midpoint of the class containing the median score, or should i give the whole class. So in the example above, should i give 34.5, or 30-39?

    Thanks in advance,
    Dan.
     
  2. jcsd
  3. Jun 2, 2007 #2

    Dick

    User Avatar
    Science Advisor
    Homework Helper

    Think of some example sets of scores that fit your grouping. Do they all have median 34.5?
     
  4. Jun 3, 2007 #3

    danago

    User Avatar
    Gold Member

    No they dont, so id give the class boundaries then?

    Thanks,
    Dan.
     
  5. Jun 3, 2007 #4

    Dick

    User Avatar
    Science Advisor
    Homework Helper

    I can't think what else you would do. BTW the class boundaries would suggest that all of the scores are integers.
     
  6. Jun 3, 2007 #5

    danago

    User Avatar
    Gold Member

    How is that so? Why does it suggest all scores are integers?
     
  7. Jun 3, 2007 #6

    Dick

    User Avatar
    Science Advisor
    Homework Helper

    Because e.g. 39.5 is not in any range.
     
  8. Jun 3, 2007 #7

    danago

    User Avatar
    Gold Member

    Oh i see. If i changed it to:

    20 <= x < 29 | 11
    29 <= x < 39 | 12
    40 <= x < 49 | 2

    Then that would allow for all scores within the boundaries, integers or not?
     
  9. Jun 3, 2007 #8

    Dick

    User Avatar
    Science Advisor
    Homework Helper

    Yep. Right.
     
  10. Jun 3, 2007 #9

    danago

    User Avatar
    Gold Member

    ok, thanks :smile:
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Grouped Data
  1. Data analysis (Replies: 1)

  2. Analyzing Data (Replies: 1)

  3. Math of Data (Replies: 0)

  4. Dihedral groups (Replies: 2)

  5. Combinatorics groups (Replies: 2)

Loading...